Backblaze B2 alternatives · File Storage
Open-source alternatives to Backblaze B2
Backblaze B2 is not described as open source on its own site. 17 of the 91 other file storage and sync services in this directory are open source, according to their own sites.
Backblaze B2 has a free plan. Paid plans start at $6.95 per TB / month. 16 of them are free or have a free plan.
17 tools · Listings checked up to Nov 13, 2026 · Where the facts come from
The 12 closest to Backblaze B2
- Free plan · from $2/mo
Duplicati
Encrypted backup to storage you choose, with a free open-source client
- Duplicati starts at $2 per machine / month, billed annually ($2.50 billed monthly). Backblaze B2 starts at $6.95 per TB / month.
- Only Duplicati lists macOS, Windows and Linux apps.
- Duplicati is open source and end-to-end encrypted, according to its own site.
- Duplicati also covers reports.
- Free plan · from $89.9 one-time
Cloudreve
Self-hosted cloud drive with many storage back ends
- Cloudreve starts at $89.9 per root domain (Pro, lifetime license). Backblaze B2 starts at $6.95 per TB / month.
- Cloudreve is open source and self-hostable, according to its own site.
- Cloudreve also covers file sharing.
- Free
Rclone
Command-line tool for syncing and mounting cloud storage
- Rclone is free. Backblaze B2 starts at $6.95 per TB / month.
- Only Rclone lists macOS, Windows, Linux and Android apps.
- Only Backblaze B2 lists a web app.
- Rclone is open source and end-to-end encrypted, according to its own site.
- Free plan · from €11.99/yr
Filen
End-to-end encrypted cloud storage from Germany with open source apps
- Filen starts at €11.99 per year for 100 GiB, or €1.99 per month for 200 GiB. Backblaze B2 starts at $6.95 per TB / month.
- Only Filen lists Windows, macOS, Linux, iOS and Android apps.
- Filen is open source and end-to-end encrypted, according to its own site.
- Filen also covers notes, file sync and file sharing.
- Free plan · from $6/mo
Filestash
Web file manager that fronts S3, SFTP, WebDAV and other storage
- Filestash starts at $6 per month (Hobby, cloud-hosted). Backblaze B2 starts at $6.95 per TB / month.
- Only Filestash lists Windows, macOS, Linux, iOS and Android apps.
- Filestash is open source and self-hostable, according to its own site.
- Filestash also covers workflow automation, file sync and file sharing.
- Free plan · from €20/yr
FreeFileSync
Open-source folder comparison and sync for desktops
- FreeFileSync starts at €20 per device (Business Edition, includes one year of updates). Backblaze B2 starts at $6.95 per TB / month.
- Only FreeFileSync lists Windows, macOS and Linux apps.
- Only Backblaze B2 lists a web app.
- FreeFileSync is open source, according to its own site.
- Free plan · from $3.99/mo
Proton Drive
End-to-end encrypted cloud storage from the maker of Proton Mail
- Proton Drive starts at $3.99 per month, billed yearly. Backblaze B2 starts at $6.95 per TB / month.
- Only Proton Drive lists Windows, macOS, iOS and Android apps.
- Proton Drive is open source and end-to-end encrypted, according to its own site.
- Proton Drive also covers documents, spreadsheets, file sync and file sharing.
- Free plan · from €71.29/yr
Nextcloud
Open source, self-hosted file sync and collaboration platform
- Nextcloud starts at 71.29€ per user / year, excl. VAT (from 100 users). Backblaze B2 starts at $6.95 per TB / month.
- Only Nextcloud lists Windows, macOS, Linux, iOS and Android apps.
- Nextcloud is open source and self-hostable, according to its own site.
- Nextcloud also covers video calls, file sync and file sharing.
- Free
Syncthing
Free, open source file sync directly between your own devices
- Syncthing is free. Backblaze B2 starts at $6.95 per TB / month.
- Only Syncthing lists macOS, Windows and Linux apps.
- Only Backblaze B2 lists a web app.
- Syncthing is open source, according to its own site.
- Free plan · from $11.99/mo
Internxt
Open source, zero-knowledge cloud storage with lifetime plans
- Internxt starts at $11.99 per month, billed annually (list price). Backblaze B2 starts at $6.95 per TB / month.
- Only Internxt lists Windows, macOS, Linux, iOS and Android apps.
- Internxt is open source and end-to-end encrypted, according to its own site.
- Internxt can be bought with a one-time purchase.
- Free plan
ownCloud
Open-source file sync and share you can host yourself
- Only ownCloud lists Windows, macOS, iOS and Android apps.
- ownCloud is open source and self-hostable, according to its own site.
- ownCloud also covers file sync and file sharing.
- Backblaze B2 also covers file management.
- Free plan · from $8/mo
Seafile
Open-source file sync and share, self-hosted or in the cloud
- Seafile starts at $8 per user / month (Plus Cloud Team plan). Backblaze B2 starts at $6.95 per TB / month.
- Only Seafile lists Windows, macOS, Linux, iOS and Android apps.
- Seafile is open source and self-hostable, according to its own site.
- Seafile also covers file sync and file sharing.
5 more that are open source
All 17 in one tableCommon questions
Is there an open-source alternative to Backblaze B2?
Yes. Duplicati, Cloudreve, Rclone, Filen, Filestash, FreeFileSync, Proton Drive, Nextcloud and 9 more are open source, according to their own sites.
Is Backblaze B2 open source?
Backblaze B2 is not described as open source on its own site. The listing was checked on Nov 12, 2026 against the pages it cites.
Which of these file storage and sync services are free?
Duplicati, Cloudreve, Rclone, Filen, Filestash, FreeFileSync, Proton Drive, Nextcloud and 8 more are free or have a free plan.
When was this checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Backblaze B2: the alternatives its listing names first, then the tools that share the most features with it.