Are there seriously people that used Megaupload as their sole and only place to store their data? What if there was a fire in the server room? Or some MU intern typed rm -rf /?
Backing up your data on Megaupload and then not keeping a local copy is active stupidity of such vast scale that I refuse to believe it has ever happened in the real world.
To borrow a famous quote.. nobody ever went broke overestimating the intelligence of the public.
That said, having your backup service raided by LEO's toadying about for entertainment conglomerates was probably not even on the list of people's possible downtime concerns..
The purpose of having a backup is so that you can restore your data after the original is lost, because there is a good chance the original will be lost. Explicitly retaining it on your local system is not enough to keep it safe. If it was, there would be no reason to backup in the first place.
If a million people used the service for backups, it wouldn't be unreasonable to expect several of them to have a drive failure each and every day.
Do you think they were zipping up the contents of their own systems and then uploading them daily?