Hi, I have a problem. Osx 10.11.2 Beta (15C48a) has told me it has detected a problem on my time machine disk, and that I need to reformat it. So I have been trying to troubleshoot the issue. I wanted to (obviously) move my time machine backup bundle to a new disk, so I can trouble shoot the old. I tried this, but 7 hours in to a 33 hour transfer, I received an error, something like: 'untitled 4.jpg already exists here'. I can't remember it, and I didn't screen shot it, but it was essentially that. With difficulty, I hunted down the offending item, and it was in Mobile Documents, within the library folder. A ridiculously difficult folder to even find, let alone access. I did however, and I deleted the offending item. As it was the back up that appeared to be the problem, I went into time machine (the 'star wars' mode), and tried to delete the ffending file using a right click delete etc. However, I got this message: 'Some files can’t be processed, either because you don’t have permission to modify them, or because they are on a locked volume.' This is the problem. I can't seem to delete these files at all. I'm the administrator of the computer, as in, it's my personal machine. Why don't I have permission for this? I have tried from within finder, and I get the same message. I'm not great with Terminal, but i have tried a few commands found via Google, and still nothing works. I haven't written everything I have tried down here I have been at it for days, but I am open to any suggestions! Thanks!