+Supported file systems are:
+
+ * *btrfs*:
+ All generations are btrfs subvolumes and named after the date and time.
+ * *ZFS*:
+ All generations are ZFS file systems. Latest generation is named `current`,
+ elders are links to the ZFS snapshot directories.
+
+The latest snapshot is always reachable using a symlink named `latest`
+inside the system directory.
+