{ ... }: { services.btrbk = { instances = { home = { settings = { snapshot_preserve = "24h 14d 4w 12m"; snapshot_preserve_min = "latest"; /* don't auto cleanup target */ target_preserve_min = "all"; volume."/" = { snapshot_dir = ".btrbk"; subvolume = { home = { snapshot_create = "always"; }; }; target = "/run/media/me/backup/morpheus"; }; }; }; }; }; }