I recently changed my data configuration in my Mac Pro. I replaced a 2TB with a 4TB and now have 13TB. I moved a couple key folders around and am now ready for a fresh new backup, having reformatted my old backup drive. I excluded almost 1TB of stuff using the "Options" button in Time Machine Preferences. But how come TM doesn't recognize this and wants to back it up anyway? It says 4.62TB required, only 4TB available. BUT my prefs clearly lists lots of "excluded" items and says estimated backup 3.78TB. What do I do, I can't get a 5TB drive and need to back this stuff ASAP as I do not currently have a backup right now until this is fixed. Thank you!