Until they shut down or start holding your data for ransom...
This story is a perfect example of why I will never trust cloud storage.
True enough - I use it as a means for people to view stuff of mine, without having to send them a large email. But I retain the originals on my own machine.
(And currently migrating a number of club newsletters from UbuntuOne to Dropbox. If Dropbox dies, then I still have the originals)