How I reach as low as $3 per computer per month is through the family plan which is something like $12-13 but allows up to 10 computers. Not only does it back up my photos, it also solves the "I clicked OK in some dialog and now the computer behaves funny" of relatives.
Are you able to access the files of your relatives with CrashPlan's web restore feature?
That feels very much like easily violated privacy/personal space to me, and is the one thing that continues to bug me whenever I consider switching to the family plan to get better value.
Yes, I think everyone can see everything within the family plan (though haven't checked if just my account is admin). To me this is certainly fine for me/spouse/children/parents but wouldn't use it for other family and friends, which I assume is what actually makes this license work without being abused.
