I can see using a single disk for recovery of accidental deletes on the road... maybe. But if you're going to do that, then you'd better ALSO regularly backup to an external disk. As others have pointed out, there are very tiny portable drives available that'll do the job. That approach is going to be more reliable, plus you'd have your whole internal HD available to use.

When a hard drive fails, it's the whole disk, not just one partition.

Will TM backup to multiple disks? I don't know, but if not, then you should keep a regularly updated clone with either SuperDuper! or Carbon Copy Cloner in addition to your TM backup that's on a single disk.



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