Listing verifiably encrypted backup systems only, because I am not crazy.
Also, I’m only listing open-source options or ones not in a jurisdiction with especially poor privacy, such as China, Russia, the UK, the USA or Australia.
Not yet done: cross-platform local backups.
See also synchronising files.
Windows, OSX, Linux.
*Choose this if… You don’t have a compelling reason to choose something else, e.g. You are not prepared to pay a small overhead in difficulty to have a trusted, encrypted backup client for backing up sensitive data to the internet cheaply to your own choice of provider.
Took me a while to decide Restic was the best option because its marketing is crap. However a helpful ycombinator post explains some upsides and points out how simple it is. It’s also very easy to install and minimal, which is a change.
Windows, OSX, Linux.
Duplicati works with standard protocols like FTP, SSH, WebDAV as well as popular services like Microsoft OneDrive, Amazon Cloud Drive / S3, Google Drive, box.com, Mega, hubiC and many others.
- Backup files and folders with strong AES-256 encryption. Save space with incremental backups and data deduplication.
- Run backups on any machine through the web-based interface or via command line interface.
- Duplicati has a built-in scheduler and auto-updater.
The full list of backends is lengthy. Looks OK but it has hefty installation requirements, being built on .NET, and I got bored trying to install .NET so this project fizzled out.
OSX, linux, more bare-bones:
Duplicity backs directories by producing encrypted tar-format volumes and uploading them to a remote or local file server. Because duplicity uses librsync, the incremental archives are space efficient and only record the parts of files that have changed since the last backup. Because duplicity uses GnuPG to encrypt and/or sign these archives, they will be safe from spying and/or modification by the server.
Linux, OSX, tarsnap comes with a server for $0.25/gb/month:
Tarsnap is a secure, efficient online backup service:
Tarsnap runs on UNIX-like operating systems (BSD, Linux, MacOS X, Cygwin, etc)
Others I’ve seen about the place
zbackup, borgbackup, attic, obnam, arq.