I'm on Mavericks, Macbook Pro mid 2010. I recently had to have Apple do a wipe and clean install to solve some bugginess I'm still not sure of. After I got the laptop back, I wanted to re-backup on Time Machine. However, I cannot seem to do it. The furthest I got was 2-3 hours later, it was about 1/4 complete (and then it stopped because I had to move to a different room and unplugged the charger, and now apparently it has to start all over). I tried to do the restart in Safe Mode, login, restart in normal mode trick that I saw on the forums, but now Time Machine is somehow even slower. It was stuck on 22 KB for a while, so I tried to eject my external HD and start over, and now it's been "preparing backup..." for 10 minutes. It's done this about 5 times tonight and I'm about to go insane. (I did do another backup with another HD with Carbon Copy Cloner, which took about 1.5 hours, but I would still like to have a Time Machine backup as well in case for some reason I need to have another clean install).