I have partitioned a 1TB external drive into three independent drives i.e. iTunes, Docs, Video. In Time Machine I have set the Preferences to only back up the internal drive (which contains my apps, settings, etc - a total of 45.58 GB). When the 1TB partitioned drive is on, Time Machine tries to back up all three of them + my internal drive resulting in the typical "too large" error message.
NOTE: Even when turned on, the other three drives don't even show up in the "Options" window where you "Exclude these items from back-ups". They do, however, show up in the "Select Disk" window.
When the 1T partitioned drive is off, Time Machine performs as expected i.e. backs up only the internal drive.
Is there a way of ensuring that only the internal drive is backed up?