Using mailing lists is a bit new to me so I hope this will end up in the right place, otherwise I'm sorry!
With regards to deleting files taking a long time, I didn't mean that the actual file operations would be slow but rather that I have a pretty extensive exclude list with a bunch of globbing patterns. So I meant that tracking down which directories and files should have been excluded and then deleting each of them would be time consuming for me. But thanks for the great article on how to revert the backup state, that will definitely come in handy. I don't have to try it out quite yet but I should be able to get some results later this week with a bit of luck. I appreciate the quick responses!