Backup a btrfs volume or subvolume using btrfs send. Supports
incremental backups.
Required.
Note: SnapshotsPath and Path both must be on the same btrfs
filesystem.
Required.
Note: This must be a btrfs subvolume.
Optional, defaults: [btrfs subvolume snapshot]
Optional, defaults: [btrfs send]
Optional, defaults: [btrfs receive]
Optional, defaults: [btrfs subvolume delete]
Optional.
Take a time interval (for example, 3d for 3 days). If set, if there
exists a snapshot that is more recent than that interval, then reuse
that snapshot for creating a backup rather than creating a new one. This
can be useful if you want to backup a single btrfs filesystem to two
(or more) destinations.