A btrfs destination can only receive unencrypted backups from a btrfs source. It will store the backup as a btrfs subvolume rather than a backup file.
Note that since backups are stored as btrfs subvolumes, all backups on a btrfs destination are considered as full backups even if they were sent as incremental backups: the merge operation between the base backup and the incremental one is done automatically when the destination receive the backup.
Required.
Note: must be in a btrfs filesystem.
Optional, defaults: [btrfs subvolume snapshot]
Optional, defaults: [btrfs send]
Optional, defaults: [btrfs receive]
Optional, defaults: [btrfs subvolume delete]