[ori_b]

If it happened with Dropbox, you would still have a local copy.

Keep a backup on media you own. Or, at the very least, mirrored across different providers.

[Domenic_S]

Until dropbox wipes their side and waits for you to sync...

[a3n]

This thing happened to my ex, although it's more likely she did the wipe. She had her home machine and two office machines synched with DB, and her stuff was gone at home and Office One. We went to Office Two, disconnected from the net, turned the machine on and copied her data to USB.

[Domenic_S]

That's good if you know it's coming, but if they surprise you...