btrbk

btrbk is a snapshotting and backup tool tailored for Btrfs that automates consistent, incremental backups using btrfs send/receive. It creates atomic snapshots of subvolumes, then efficiently transfers only changed blocks to local or remote targets over SSH. A declarative configuration describes sources, targets, and retention policies (hourly/daily/weekly/monthly), and btrbk enforces pruning so backup stores don’t grow without bound. The tool supports hierarchical setups—many subvolumes to many destinations—and can throttle, pre/post-hook, and verify operations for reliability. Because it uses native Btrfs primitives, restores are fast and space-efficient, and replicas can be mounted instantly for inspection. Clear logging and dry-run modes make it safe to adopt in production while giving operators visibility into every snapshot and transfer.