So out of nowhere Time Machine isn't backing up correctly. I attached screen shots of exactly what is happening. On my internal HD, I have 322GB used, 64 GB excluded from backup, and an external HD capacity of 297 GB. For all those non mathematicians out there, I am trying to back up 258 GB on a 297 GB drive. I'm not exactly sure what TM is trying to do here or how to fix the situation. Any help is appreciated..