Comparison of online backup services

This is a comparison of online backup services.

Online backup is a particular kind of file hosting service; however, various products that are designed for file storage may not have features or characteristics that others designed for backup have.

Comparison

Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3[1]	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location(s)10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
Acronis	Yes	Yes	Yes	Yes	Yes	Yes	Optional[2]	Yes	No	Yes	No	Yes	Acronis	No	No	Yes				United States,  Europe	No	No limit	Yes			No
ASUS WebStorage	Yes	Yes (only 32 bit)	Yes	Yes	Yes	Yes	No	?	Yes	No	Yes		ASUS WebStorage		No	Yes	Yes	Yes	Yes	United States, ASIA	5 GB	500 MB (Free) 10GB (Paid)	Yes			No
Backblaze	Yes	No	Yes	Yes	Yes	Yes[3]	Optional[3] But company must be given passphrase (to private key) to restore any data.	?	No	Yes	No	Yes	Backblaze		No		Yes	No	Yes	United States	No	No limit	Yes	No		No
Barracuda Backup Service	Yes	Yes	Yes			Yes[4]	No	?	No fee per computer	No	Yes		Barracuda Backup Service	Yes	No	Yes		No	Yes	United States, APAC,  Europe	No			?		No
Bitcasa	Yes[5]	Yes	Yes (Only 64-bit)	Yes	Yes	Yes	Bitcasa cannot decrypt data, but uses convergent encryption15 [6]	?	Yes	No	No	Yes	Bitcasa	Yes[7]	No	Yes	Yes	Yes	Yes	United States	5 GB[8]	No limit[9]	No[10]		No, Amazon AWS[11][12]	No
Box	Yes	Partial (no offline sync, access through DAV server)[13][14]	Yes	Yes	Yes	Yes[15]	No[15]	?	Yes	Yes			Box	Yes[16]		Yes[17]	Yes			United States	10 GB	250 MB (Free) 5 GB (Paid)				No
BullGuard Backup	Yes	No	No	Yes	Yes	Yes[18]	Yes	Yes	Yes		Yes		BullGuard Backup	Yes	No		Yes		Yes	Europe	No			?		No
Carbonite	Yes	No	Yes	Yes	Yes	Yes	Yes for Windows only[19]	?	Yes (Business only)	Yes (Home only)	No[20]	Yes [21]	Carbonite			Yes	Yes	Yes[22]		United States	No	4 GB	Yes[23]	Yes		No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
CloudBerry Lab	Yes	Yes	Yes	No	No	Yes	Yes	Yes				Yes	CloudBerry Lab	Yes	No	Yes	Yes		Yes	Global	No	No limit	Yes	Yes		No
CloudMe	Yes	Yes	Yes	Yes	Yes	No, but 3rd party apps available		?		No		Yes	CloudMe	Yes[24]	Yes	Yes	Yes			Sweden	3 GB	150 MB (Free Accounts) No limit (Premium Accounts)	No Limit	No		No
Comodo Backup	Yes	No	No			Yes[25]	No	?	Yes	No	Yes (5)		Comodo Backup	No	No	No		No		United States	No					No
CrashPlan	Yes	Yes	Yes	Yes	Yes	Yes[26]	Yes, except for web restore[27]	Yes	Optional	Yes	Yes	Yes[28]	Crashplan	No	Optional	No	Yes[29]	No	Yes	United States,  Australia[30]	No	No Limit	Yes[31]	No		No
Datto	Yes	Yes	Yes			Yes	Yes, key must be provided for cloud virtualization						Datto				Yes		Yes	United States (bi-coastal)
Diino	Yes	Yes	Yes			No[32]	No	?	Optional	Yes	Optional	Yes	Diino	Optional			Yes	Yes			No	No limit		?		No
Dropbox	Yes	Yes	Yes	Yes	Yes	Yes	No,[33] but 3rd party apps available[34]	?			Yes		Dropbox	No	No	Yes	Yes	Yes		United States	2 GB	300 MB (Web Interface) No limit (Desktop client)	No	No	Was Amazon AWS, but references removed from FAQ.	No
Dropmysite	Yes	Yes	Yes			Yes	No	?	Yes	Optional	No	Yes	Dropmysite			Yes	Yes	Yes		Global	2 GB	No limit		?		No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
Druva Insync	Yes	Yes	Yes	Yes	Yes	Yes[35]	Optional[35]	?	Yes[35]	Yes[35]	No	Yes	Druva Insync			Yes	Yes	Yes		United States,  United Kingdom,  Japan,  Brazil,  Singapore,  Australia [35]	No	No limit		Yes		Yes
Egnyte	Yes	Yes	Yes			Optional[36]	Optional[36]	?					Egnyte	Yes[37]	No	Yes	Yes	Yes		United States	No	No limit		?		No
ElephantDrive	Yes	Yes[38]	Yes	Yes[39]		Yes	Optional (off by default) [40]	?	Yes	No			ElephantDrive	Yes[41]		Yes[42]	Yes	Yes[43]		United States	2 GB		Yes	?	No, Amazon AWS[12][44]	No
EVault	Yes	Yes	Yes				Yes	?	No	No	Yes	Yes	EVault	Yes	No	No	Yes		Yes	United States,  United Kingdom,  Canada,  Ireland	No	No limit	Yes	Yes		No
FilesAnywhere	Yes	Partial	Yes	Yes, via Storage Made Easy client	Yes, via Storage Made Easy client	Optional[45]	No[46]	?	Yes	No	Yes	Yes	FilesAnywhere	Yes[47]	No	Yes	Yes	Yes	Yes	United States	1 GB	No limit	Yes			No
Google Drive	Yes	No, but there are third party clients in the List of backup software like Duplicati, etc. The client grive is not in the list. Official support is planned since April 2012.[48][49][50]	Yes	Yes	Yes	Yes	No, available with third-party clients, such as Duplicati	?		Yes, w/5+ users on Google Apps for work + unlimited or Business or Education [51]	Yes	Yes	Google Drive	No	No	Yes	Yes	Yes		United States, Worldwide	15 GB	5 TB[52]			Partial: 34%[53]	No
Handy Backup	Yes	Yes	No	Yes		Yes	Yes	?	Yes	Yes	Yes	Yes	Handy Backup	No	No	Yes	Yes	No	Yes	United States,  Canada	No[54]	No limit	Yes	Yes		No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
Trend Micro SafeSync	Yes	Partial	Yes	Yes, via Storage Made Easy client	Yes, via Storage Made Easy client		No	?			Yes		Trend Micro SafeSync	Yes		Yes		Yes		United Kingdom						No
IASO Backup	Yes	Yes	Yes		Yes[55]	Yes[55]	Yes	?	Yes	Yes	Yes		IASO Backup	No	No	No	No	Yes		United States, Worldwide	No	No limit	Yes	Yes		No
ICFiles	Yes	No	No	No	No	Yes	Hardcoded	One Way Encrypt	Yes	No	Yes	Yes	ICFiles	No	No	No Sync is Vulnerable to Cryptolock, ICF Express has Auto Upload	Yes	No		United States	clients of clients	.com 4 GBs-Desk App No Limit	No		IBM SOC2	IBM SOC2
iCloud	Yes	Yes, via Storage Made Easy client	Yes	Yes, via Storage Made Easy client	Yes	Yes	No	?	?		?		iCloud	?		?	?	?		unknown	?				Yes, 94%[12]	No
Infinit	Yes	Yes	Yes			Yes[56]	Optional[56]	?	No	Yes	No	Yes	Infinit		Yes	Yes	Yes	Yes				No limit	Yes	Yes		No
Infrascale	Yes	Yes	Yes	Yes	Yes	Yes	Optional	Optional	Yes	Yes	No	Yes	Infrascale	No	No	Yes	Yes	Yes	Yes	United States,  Canada,  United Kingdom,  South Africa,  Australia,  New Zealand,  Jamaica	No	No limit	Yes	Optional		No
Iperius Online Storage	Yes	No	No			Yes[57]	Optional[57]	?	50, 100, 200, 500 GB	No	No	Yes	Iperius Online Storage		No	Yes	Yes	No	Iperius Online Storage			No limit				No
Intronis	Yes	No	Yes	Yes	Yes	Yes	Yes	configurable	Yes	No[58]	Yes	Yes	Intronis	Yes	No	Yes[59]	Yes	No	Yes[60]	United States,  Canada	No	No limit	Yes	Optional	Yes	No
Jumpshare	Yes	No	Yes	No	No	Yes[61]			Yes	No	No	Yes[62]	Jumpshare		No	Yes	Yes	Yes	No	United States,  Europe	2 GB	250 MB on free, Unlimited on Jumpshare Plus			Yes	No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	Physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
Jungle Disk	Yes	Yes	Yes	Yes	Yes	Yes[63]	Yes[63]	Yes			Yes	Yes	Jungle Disk	Yes[64]	No	Yes	Yes	Yes		United States,  Europe	No	No limit in Backup Vault	Yes		Partial, Amazon AWS[12][65] or Rackspace Cloud Files.	No
KeepVault	Yes	No	No			Yes[66]	Yes[67]	?	Yes	No	Yes		KeepVault				Yes			United States		20 GB				No
KineticD	Yes	No	Yes	Yes	Yes	Yes	No	?	No	Yes	Yes	Yes	KineticD	Yes	No	No	Yes	Yes	Yes	Canada	No	No limit	Yes	Yes
Livedrive	Yes	No	Yes	Yes	Yes	No	No	?	Yes	Online Backup only	No	Yes	Livedrive	Yes (paid-only)[68]	No	Yes	Yes	Yes	Yes	United Kingdom	No	No limit	Yes			No
MediaFire	Yes	Upload only	Yes	Yes	Yes	No	No	?	Yes	No	Yes	Yes	MediaFire	No	No	Yes	Yes	Yes		United States	10 GB	No Limit	No	No		No
MEGA	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes[69]	Yes	No	Yes	Yes	MEGA	No	No	Yes	Yes, using MEGAsync client	Yes	No	Europe,  New Zealand	50 GB	No limit	No	No		No
Memopal	Yes	Yes	Yes	Yes	Yes	Yes[70]	No[71]	?			Yes		Memopal			Yes		Yes	Yes	United States,  Europe, Asia	3 GB	5 GB				No
MiMedia	Yes	No	No			Yes[72]	No	?	Yes	No	Yes	Yes	MiMedia	Yes	No	No	Yes	No	No	United States	7 GB	3 GB	Yes			No
Mozy	Yes	Yes	Yes	Yes	Yes	Yes[73]	Optional[73]	?	Yes	No			Mozy		No	Yes	Yes		Yes	United States,  Europe	2 GB	No limit [74]	Yes	No		No
OneDrive	Yes	No, see note[75]	Yes	Yes[76]	Yes	No[77]	No	?	Yes	No			OneDrive	No		Yes					5 GB for new users, 25 GB for older users	10 GB			Partial, 29%[12]	No
OwnDrive	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?					OwnDrive			Yes	Yes				1 GB					No
SpiderOak	Yes	Yes	Yes	No, the android client is only capable of accessing spideroak cloud data	Yes	Yes[78]	Yes[78]	?	Yes	Yes, Occasional offers for unlimited	Yes	Yes	SpiderOak	No[79]	No	Yes	Yes	Yes			(2 GB free for 60 days only)	No limit	Yes	Yes[80]		No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant
SugarSync	Yes	No	Yes	Yes	Yes	Yes[81]	No[82]	?	Yes	No	No		SugarSync			Yes	Yes	Yes (SugarSync account needed for folders)			No	100 MB (web) No limit (client app)[83]				No
Syncplicity	Yes	No	Yes	Yes	Yes	Yes[84]	No[84]	?			Yes		Syncplicity			Yes	Yes	Yes		United States	10 GB					No
Tarsnap	Using Cygwin	Yes	Yes	No	No	Yes	Yes[85]	?	No	No	Yes		Tarsnap	No	No						No				No, Amazon AWS[12][86]	No
TeamDrive	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes, via self-hosting	No	Yes	TeamDrive	Yes{{[87]}}	No	Yes	Yes	Yes	No	United States,  Germany,  Ireland,  Hong Kong	2 GB	No limit	Yes		No, Amazon AWS by default[12][88]	No
Tresorit	Yes	Yes[89]	Yes	Yes	Yes	Yes	Yes	?	Yes	No	Yes	Yes	Tresorit	No	No	Yes	Yes	Yes	No	Europe[90]	3 GB	0.5 GB (free), 10 GB (paid)[91]	Yes	No		No
Unitrends Vault2Cloud	Yes	Yes	Yes			Yes[92]	No	?	No	Yes	Yes		Unitrends Vault2Cloud	Yes	No	Yes		No	Yes	United States	No					No
UpdateStar Online Backup	Yes	No	No			Yes[93]	No[94]	?	Yes[95]	Yes			UpdateStar Online Backup							Europe						No
Vembu OnlineBackup	Yes	Yes	Yes	Yes	Yes	Yes		Yes			Yes	Yes	Vembu OnlineBackup	No	No	Yes	Yes			United States, APAC, Europe	Yes	Yes	Yes	Yes	No	No
Yandex.Disk	Yes	Yes[96]	Yes	Yes	Yes	No[97]	No	?	Yes				Yandex.Disk	Yes[98]	No	Yes		Yes			10 GB	10 GB				No
Zetta.net	Yes[99]	Yes	Yes			Yes	No	?	Yes	No	Yes[100]	Yes	Zetta.net	Yes[101]	No	Yes	Yes	No	Yes	United States[102]	No	No limit	Yes	Yes		Yes
Zmanda Cloud Backup	Yes	No	No			Optional[103]	Optional[103]	?			Yes		Zmanda Cloud Backup	Yes					Yes	United States,  Europe,  Singapore,  Japan		No limit	Yes	Yes	Partial, Amazon AWS or Google Cloud Storage[12][104]	No
Provider	Win.1	Linux1	Mac1	Android1	iOS1	Encrypted storage	Zero knowledge2	Secure Key Management3	Limited MB plan4	Unlimited MB plan4	$/MB plan4	Unlimited BW 17	Provider	Cloud hosted Net Drive5	P2P6	Sync7	Autodetect changes12	Public file hosting8	physical media restore9	Server location10	Free online storage (non-trial)13	Maximum per-file size	External hard drive support14	Hybrid Option15	Green Hosting	ITAR Compliant

Legend

• ^1 Windows/Linux/Mac/iOS/Android/BlackBerry - Supported operating systems for thick client (native binary application), which provide background data transmission and setting services.
• ^2 Zero knowledge - The user needs to manage their own encryption key or password. If they lose it, there is no way to access the data. The service provider cannot access the user's data even if required by the government.^[105][106] Backup service providers often claim that no one can access the users data even though they themselves could if forced to do so, so entries claiming support of this feature should always have a supporting reference. If the backup service has a password recovery or reset mechanism that allows a user to access their data when they lose their password or key, that proves they do not have zero knowledge.^[107]
• ^3 Secure Key Management - If yes, the user holds and controls of the encryption key. If no, the service provider holds and controls the encryption key.
• ^4 Payment options/plans:
  • Limited MB plan - Pay per computer. Additional fee for storage over a threshold.
  • Unlimited MB plan - Pay per computer. Storage per computer is unlimited.
  • $/MB plan - Pay per unit of storage, but unlimited computers may share that storage.
• ^5 Cloud hosted Net Drive - Cloud can serve storage over WebDAV, SMB/CIFS, NFS, AFP or other NAS protocol, allowing files to be streamed from the cloud. A change made to the cloud is immediately accessible to applications on all clients without needing to pre-download (sync) the file in full.
• ^6 P2P storage - data spread over many computers based on peer-to-peer net advantages.
• ^7 Sync - Synchronization between computers, and/or mobile devices (PDA, MDA,...)
• ^8 Public Internet file hosting -
• ^9 Restore via physical media -
• ^10 Server location - countries where physical servers are located. Where the data will be located.
• ^11 Still in Beta version
• ^12 Whether the desktop client (if available) can detect and upload changes without scanning all files.
• ^13 Many backup services offer a limited free plan, often for personal use. Often it is possible to increase the free backup limit through coupons, referrals, or other means that are not included in this column. This column also does not include free trials that are only available for a limited period of time.
• ^14 External hard drive support - Can refer to an alternate backup destination or whether the service can back up external drives.
• ^15 Hybrid Online Backup works by storing data to local disk so that the backup can be captured at high speed, and then either the backup software or a D2D2C (Disk to Disk to Cloud) appliance encrypts and transmits data to a service provider. Recent backups are retained locally, to speed data recovery operations.
• ^16 Bitcasa encrypts each file with a key derived from that file, so a file can be decrypted only if you already have (or have had) the decrypted version. Therefore, bitcasa cannot decrypt arbitrary files, but they could e.g. remove a specific requested file or log which users access a specific requested file. There also is a learn-the-remaining-information attack possible.^[108][109]
• ^17 Unlimited BW - If bandwidth capping or limits are used on accounts.

Comments

Acronis

Up to five PCs, always incremental backups, remote access from the web

AltDrive

Data de-duplication; block-level incremental; unlimited offering. Home (1–3 computers) or biz service (1–1000 computers). Client-side encryption, external USB drives, NAS support for Biz customers.

ASUS WebStorage

Auto-upload on designated folder, auto-backup capabilities, cross-platform file access of upload and sharing - iOS, Android, Windows Marketplace, OS X, Ubuntu, Linux, Windows Store (Windows 8) also any compatible browser. 5 GB of free data. Upload limit for each file of 500 MB on free account. Daily file sharing limit of 500 MB on free account. Free account will only allow one computer to be able to back up.

Backblaze

Data de-duplication; block-level incremental

Barracuda Backup Service

Data de-duplication; real-time hybrid on-site/off-site data back-up

blaucloud  

No User Limit each User get his ownCloud Instance in an encrypted Storage.

BullGuard Backup

5 PC/license, fast upload speeds, mobile access, encrypted transfer and storage, password-protected settings, free 24/7 support

Carbonite

Block-level incremental, Home or Pro editions. iPhone/ Blackberry/ Android App available to remotely access data from the online backup (For Pro: Users of the computer which are backed up, not available for the Administrator of the Pro). Can manually select files to upload that are larger than 4 GB.

Crashplan

Unlimited destinations. Data de-duplication; block-level incremental. Can run server-free, exchanging backup space with friends and family.

Datashield  

High-level encryption, personalized encryption key, shared cloud drive, sync folder functionality

Datto

Focused on business continuity and total data protection for small and medium businesses. Offers instant virtualization of backed up instances locally or securely in the cloud. Datto maintains its own private cloud with 250+PB of protected data in 9 data-centers.

Dolly Drive

Cloud storage that is specifically designed for the Mac. Also allows users to store files exclusively in the cloud for seamless access on any computer or mobile device.

Diino

iPhone/Android app available.

Dropbox

Data de-duplication, delta sync, iPhone/Android/Blackberry app available.

Dropmysite

website backup, database backup, SFTP support, free up to 2 GB.

Druva inSync

Integrated Backup and File-sharing. HIPAA and ISAE3400 compliant

Egnyte

Delta sync, Google Docs sync, user and group management

ElephantDrive

Auto-transfer from defunct Xdrive.

FilesAnywhere

Mark Cuban acquired minority interest in 2006. Android, iOS, BlackBerry apps available. Dedicated server options available. CoolBackup software used for backup and sync.

F-Secure

[Steek acquired by F-Secure July 2009]

Humyo

Humyo was acquired by Trend Micro and will become part of Trend Micro SafeSync. Humyo no longer accepts new clients.

IASO Backup

Advanced data reduction technology. Data de-duplication mechanism. High level of scalability and cost effectiveness.

ICFiles

Secure File Share Storage. Proprietary license download client. High level security, SOC 2 TYPE II, ISO 27001,27017, 27018, CSA, PCI, HIPAA, CJIS, EU Model Clauses, on request private servers for FISMA and FedRAMP.

IDrive

Proprietary license download client. Automatic Selection. Continuous Data Protection. "Virtual drive" explorer.

Jungle Disk

Proprietary license download client sample code.

KeepVault

Real-time hybrid on-site and offsite data backup

Memopal

Cross-user de-duplication, delta sync

MiMedia

Initial seed via a MiMedia-owned external hard drive available (no extra cost, shipping included).

Mozy

Data de-duplication; block-level incremental. "Mozy Data Shuttle" physical seeding service available for extra fee.

Replicalia

Professional Backup for Professional Data

pCloud

Data de-duplication. Zero Knowledge Privacy with client-side encryption.

SpiderOak

Data de-duplication."Zero Knowledge" encryption.

StoreGrid Cloud  

Byte-level incremental backup, local backup, Disk Image backup - BMR and physical seeding.

Syncplicity

Google Docs sync, Central Management with Business Console

TaniBackup (Cheap Backup) 

Up to 10 TB per standard package. Extensible to over 300 TB per single account. Access via SMB/CIFS or SSH (including sftp, scp, rsync and so on). 100 GB for $2 per month.

Tarsnap

Client source available; data de-duplication; block-level incremental.

TeamDrive  

Store encrypted data on any WebDAV server; supports working offline; files can be commented; built-in support for conflict resolution.

Tencent Cloud (English)

Tencent is offering users 10TB of free cloud storage^[110]

Unitrends Vault2Cloud

Data de-duplication; hybrid on- and off-premises data backup; physical seeding

UpdateStar Online Backup

Data de-duplication; block-level incremental

Usenet backup

Is the method of storing backup data on the usenet.^[111]

Windows Live Mesh

Replaces windows live sync and windows live folder

Zetta Enterprise-grade Online Backup

Supports Linux, Mac OS, and Windows, high speed WAN optimization, SAS 70 certified data centers

Zmanda Cloud Backup

Available in German and Japanese languages, supports MS SQL Server, MS Exchange, SharePoint, MySQL Database, System State, Oracle

Versioning

Any changes can be undone, and files can be undeleted.

Acronis

Supports detailed history of changes to files with browsing by date or version number.

AltDrive

Old versions of files are kept for 60 days. Biz customers choose their retention policy of 30 days to 7 years to forever.

Backblaze

Old versions of files are kept for 30 days.

blaucloud  

Keeps old version if vesioning app is activated (included in all plans even FREE) until users runs out of storage.

Box  

Versioning is included in paid subscription

Carbonite

Keeps old versions for up to three months. It keeps one version for each day of the past week, one version for each of the previous three weeks, and one version for each of the previous two months that the file has been backed up. Versioning available for PC computers only; not available for Mac.

Crashplan

Options: All, or staged (daily, then weekly, etc.).

Cubby  

All previous versions and deleted files are kept until explicitly removed by the user or the user runs out of space. All deleted files and previous versions count towards the storage limit.

Dolly Drive

Yes. Keeps unlimited versions of files.

Dropbox

By default, Dropbox saves a history of all deleted and earlier versions of files for 30 days for all Dropbox accounts.^[112]

Dropmysite

Provides incremental backups with the ability to download every snapshot.

Druva inSync  

Unlimited, Timeline based restores

ElephantDrive 

Any number of versions can be kept for any amount of time.

Google Drive

Old versions of files are kept for 30 days or 100 revisions. Revisions can be set not to be automatically deleted.

IASO Backup  

All versions of files can be kept for different periods of time, starting from 1 month to 1 year or more.

ICFiles  

No files are kept after delete, auto delete clears at every 24 hours.

iDrive  

Up to 10 old versions of files are kept forever (until explicitly removed).

Mozy  

Old version of files are kept for 30 days. Pro 60 days, Enterprise 90 days.^[113]

pCloud

Versioning is included for free (30 days) and paid plans (180 days). Deleted files can be restored within the same timeframes.

PowerFolder  

Five versions are kept online. In the client it is configurable how many versions to store locally.

SOS Online Backup (Infrascale)

All versions are kept. Only the largest counts towards the storage limit.

SpiderOak

All versions are kept. All files can be undeleted.

SugarSync

Five versions are kept. Only the most recent version of each of existing files as well as deleted files count towards the storage limit.

Syncplicity

Old versions of files, as well as deleted files, are kept for 30 days. Configurable for business or enterprise-class services.

TeamDrive  

All previous versions are kept and can be restored.

Tresorit  

Versioning is included in paid subscription

Zetta Enterprise-grade Online Backup

All versions are kept. All files can be undeleted.

Other features and limitations

Other notable limitations or features.

Box

Performance degrades after 10,000 files in sync folder. Technical limit of 40,000 files in sync folder. Does not sync .tmp files, Outlook PST files, hidden files (hidden folders are synced), or any file or folder with \/*?":<>| in the name.^[114]

Dropbox

Performance degrades with more than 300,000 files in sync folder. This is a soft limit.^[115]

pCloud

Can exclude certain file types (e.g., .tmp files) with a file type exclusion filter.^[116]

Sugarsync

Limited to 80,000 files per top level sync folder. To workaround, you can create multiple syncing folders, but each top level folder is limited to 80k files. Also, Microsoft outlook and Apple iTunes databases are unsupported.^[117]

Defunct services

• Copy was discontinued on May 1, 2016 ^[118]
• Dell DataSafe was discontinued on June 11, 2015.^[119]
• drop.io
• Norton Zone was discontinued on July 7, 2014.^[120]
• Trend Safesync (not included in the table above) is no longer available and existing accounts will be purged on January 31st 2017.^[121]
• Ubuntu One was discontinued on June 1, 2014.^[122]
• Windows Live Mesh
• Wuala was discontinued on November 15, 2015.^[123]
• Xdrive
• ZumoDrive
• PogoPlug, discontinued online backup services September 28, 2016

See also

• File hosting service
• Remote backup service
• Comparison of online music lockers
• Comparison of file synchronization software
• Comparison of file hosting services
• Cloud storage
• Shared disk access
• File sharing
• List of backup software

Notes

References