wal-g can create delta backups which only contain changes since the last backup. Consider using the delta backup feature of wal-g to reduce backup size and speed up backups. Test the gains in size and backup speed we get and in how far this affects restore performance. ## Acceptance criteria * [ ] we got data on backup size and performance gains and restore speed * [ ] we decided if we want to use delta backups based on above data * [ ] we implemented delta backups (if the answer was "yes")