Should I rely on Megaupload as the only place to store my vital files?
No! It is good practice to always keep more than one backup of any file you cannot afford to lose. Although we are going to great lengths to ensure the long-term integrity and availability of your data, there is always a (very slim) chance of a loss – e.g. because of natural disasters affecting our data centers or someone reporting an acceptable use policy violation affecting your files or files appearing in their context. We take no responsibility for the long-term availability of your files!
