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What is 🗃️snapkup?

Snapkup is a simple backup tool that takes snapshots of your filesystem (or the parts that you'll decide), storing them efficiently and conveniently.

You initialize an empty directory that will store the backups
You register one or more backup roots, i.e. directory or files that will be snapshotted;
You take one or more snapshots. Snapkup lists all the tree for those roots, taking a copy of the contents;
You can restore the situation of the roots at any given snapshot. Of course, it's possible to list roots and snapshots and delete any of them, and perform all the other admin operations.

Built with Go(lang). You get one statically linked binary, and that's all you need;
Files are deduplicated: only one copy of a file is stored, across the filesystem and all the snapshots;
Everything stored on-disk is encrypted, using XChaCha20Poly1305
Checksums, using authenticated 128-bit SipHash, are used to perform deduplication and ensure integrity;
By default, everything is compressed using zstd -19. Incompressible files are stored as not compressed;
Small files can be merged in "agglos", to reduce the number of files and make it more sync-friendly (e.g. for Dropbox)
Snapkup favors features and code readability over speed. It's not slow, though!
All paths are converted to absolute paths, for consistency;
Cross-platform portability of backup archives is not a priority, though it should reasonably work.

Ability to produce all outputs as JSON, for better script-ability;
Ability to retrieve files from external filesystems, via SSH;
Ability to back up data that come from the execution of a command (e.g. crontab -l);
FUSE-mount a snapshot.