@Natanox in almost all cases, you'll be better off just backing up stuff regularly with deja-dup / duplicity [included in @ubuntu LTS Desktop per default] or #rsync and use #btrfs since unlike #ext4 and #ZFS, it'll be less straining in terms of write operations [which are the limiting factor of SSDs] and you don't want to use "journal-less ext4" outside of embedded devices!...

#ZFS is great for NASes and Server but there is a reason why not even #Canonical defaults to using it on #Desktop.