Obviously, when you’re considering CCC and Time Machine backups, it’s much more likely that media problems could damage portions of a backup, but that’s why you have multiple types of backups on multiple drives. And the likelihood of there being media corruption for an Internet backup would seem to be very low, given how data is generally replicated across multiple drives in a datacenter. It’s not impossible, I’m sure, but it seems unlikely given the extent to which most backup programs do checksumming to make sure what they’ve written out matches what they’ve read.
I’m less worried about particular files within the backup having problems. It seems to me that if you can restore a few files, the rest should generally be fine. As with the example in the article, the terrible horrible awful no good problem is when you think you’re backing up, but for one reason or another, your backups are completely worthless.
The reason I suggested a couple of random files is that what I’m worried about is the entire backup being corrupted.
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