These are the closest match on this list. Deja Dup, GNOME's own Backups app, encrypts and compresses the folders you choose, on a schedule, using Restic behind the scenes. Copy Shelter does the same job, encrypted on the machine with a key only you hold, and adds a read-back check on every copy.
Two tools writing to two places fail for different reasons. If Deja Dup is already running well for you, adding Copy Shelter as a second, checked copy somewhere else is a reasonable way to raise confidence without replacing what already works.
Can you get a file back today, from the backup as it is now, on a machine that has never seen it? Try it with one file before you need it. Copy Shelter's answer is csctl and the published format.
Yes, for file backup on Linux. The two are closer to each other than most on this list: both encrypt, both schedule, and both cover the folders you choose, going beyond system files alone.
Not as a routine, separate check. Copy Shelter reads every copy back and compares it against its own hashes, and reports a copy that has not been checked as not counted.
Yes, entirely, with no paid tier. It is open source under the GPL and ships through Flathub and most distributions' repositories.
Yes, for one backup location, with no time limit. Pro adds more locations, older versions and scheduled deep checks, on every platform it runs on.
Deja Dup figures are from apps.gnome.org/DejaDup, read on 19 September 2026. Related: Copy Shelter and Timeshift, Copy Shelter for Linux.