I have two backup hard discs for Time Machine: 1.5TB, and 1TB. My backup fits in 1.5TB, but Time Machine sometimes complains that it can't backup to the 1TB disk, because the space is not enough.
Can I ask it to automatically select only some directories to back up, instead of failing to back up? I still want everything backed up to the 1.5TB disc.
I'm not using the 1TB hard disc, anyway, so I would like to backup some data to it rather than none, in case both my computer and the 1.5TB hard disc fail.