They are not good for backups. You will find that a lot of your files are corrupted or inaccessible. Megaupload was great in that respect. Also what they say or write does not matter, it is how they react and act over time that matters. I have had entire directories of files get deleted from many accounts both free and premium. I cant imagine that they would get deletion notices on a couple of hundred files since I used to get like 1 or 2 deletions a month for years before. I know a few searchers that scan them and copy what ever you have in your directory even if you never publish the links they post it in the search engines for download. There is no way to prevent access to your files. Much harder to do that with RS since need a matching MD5 or link so almost impossible.

Since filenames can be changed on the fly I could just take a any link and add any filename I want and post a link.. So you can also just put in a number for files you upload but when you post the link you can change the number to the file name..

eg
http://www.filefactory.com/file/2f67sgjyhlnh/n/50.txt

just change the 50.txt to anyolefilename.bin

This gets rid of the searchers but dont help with mass deletions..

They had 2TB storage space for members.. So I would think that when you get over 4TB they will get nervous.. I am sure if you dont bring them any revenue on the files then even 2TB would be too much in the fair usage policy.. Although even uploading 2 TB would be considered an impossible job considering all the technical problems.