Comment: Re:Evidence (Score 5, Informative) 592
The actual answer is (as always) to have backups of anything you feel is important. If the data is important enough, you make multiple backups to different kinds of media and store them in different places.
And, with any backup solution, one must plan for contingencies. Now that MU is offline, and the other personal file uploading sites are in danger of the same scrutiny/takedown, maybe it's time to roll your own private cloud with friends and family as storage nodes. They host your files, you host theirs. Model it after a weird hybrid bittorrent/RAID setup. That whole Storage Spaces thing from Microsoft would be a good model if it can be scaled to the network layer. The loss of any node would not bring down the entire storage pool and would allow itself enough time to re-balance the load among the remaining nodes.
Obviously, there are some logistics concerns with this method. However, a private cloud like this would certainly survive the antics of a jilted media conglomerate (or a cabal of them). And, as it would be a backup solution to data you are already keeping elsewhere (right?), it wouldn't be the only copy of the data in the event the cloud goes down.