btrbk
Tool for creating snapshots and remote backups of btrfs subvolumes
...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.