It's weird, time machine use to work fine. I have 3 HDD connected to my computer, and one of the slaves is mac journal case sensitive. Backups have been fine for the last couple months. However recently, time machine will not back up exactly a chunk of 222gb of data. When time machine gets to that point, it just stops. No error message no nothing. And at the top, it says "waiting for backup." Nothing else. I reformatted the hard drive guid, mbr, case sensitive etc etc, nothing. I even swapped out the external hdd and same problem. How do I troubleshoot this or find out what is causing the problem? Is there a particular format time machine doesn't want to backup? Is there a partition format type time machine doesnt like?