The problem is not just DR, but anything that can result in data loss. There was the one where they'd delete stuff you didn't mean to [1], the one where they got stuff back by the scruff of the neck [2]... i can't be arsed to look further back, but I'm pretty sure shit happened earlier as well (and I'm just looking at GMail). And of course there are tons of horror stories about accounts disabled or deleted for commercial or other unspecified reasons, because once you put your trust in another entity, that's it, they can do as they please. Their track record might be as good as anyone's, but it still has a few holes and people should prepare for it rather than considering "the cloud" as a magic bucket.

(disclaimer: my life would probably be ruined by losing the gmail account I've held since private-beta days, because life is short and I'm shit at sysadmin; but there's a big difference between a lone old geek and large organizations...)

[1] http://www.dailymail.co.uk/sciencetech/article-2548010/Has-G...

[2] http://www.datacenterknowledge.com/archives/2011/03/01/googl...