He mentions in a comment that he was using their web interface to access individual files while his laptop was out. Also, the free plan was limited to 2GB. Given that he isn't exactly screaming about it, I think that this was either not his most important data, or not his primary backup recourse.

I sympathize, because in the last 10 years I've probably "OKed" over 100,000 pages of TOS, and not read a single one.

The fact that all his files were gone and he didn't know it means one of two things: either they are disorganized, or pretty fucking nonchalant about wiping user data. Either is unacceptable in a backup company.