- support multiple repositories
- implement "backup mode" like described here: https://serverfault.com/questions/885117/disable-all-services-except-ssh
- shut down all services except ssh and restic
- take BTRFS snapshot
- start services
- chroot to snapshot and start restic backup
- remove snapshot after completion
- if multiple destinations are used, when is the snapshot deleted?
- always keep the last snapshout around?
- use btrbk unstead of rclone?