So my running backup from the last year and a half got corrupted somehow when I upgraded to Lion. After several attempts in vain to get it to back up, I ended up deleting the whole blasted thing and starting a brand new initial backup from scratch! (Losing my ability to downgrade to SL in the process, but I am 'mostly' happy with Lion anyway.... just a few annoyances so far that I have found workarounds for.) What was happening before was it was hanging on 'Preparing Backup' and wouldn't do anything else. My new backup went from 'Preparing Backup' to 'Calculating Size' fairly quickly so I know it's working.... but..... 5 DAYS TO COMPLETE AN INITIAL BACKUP??? That's what it's telling me!!! I don't remember my first initial backup taking THAT long!! I am only using roughly 70 GB of my 320 GB HD!!! That's insane! My question is, is it ok to use the MBP during the 5 days? And, if for some reason it gets interrupted (like someone shutting the laptop lid or a power outage or something)... will it append where it left off or will start all over again?? Btw - before anyone yells at me, I did post a similar question in the Lion forum, but it was more related to my initial problem where Time Machine was hanging... before I decided to delete and start a new backup from scratch. And yes, the backup was corrupted... because the new backup is actually showing progress!! The old one just hung and there was no activity beyond the 'Deep Traverse' message, and I had left it go for hours... The new backup got past 'Preparing' after only about 25 mins.