You have misunderstood the upload status "Failed" at Mirrorcreator.
It doesn't mean the files were deleted, but MC couldn't push them to the intended hosts in the first place, because the hosts weren't in receiving mood at the time of uploading. MC only tries few times within 10 or 20 minutes, and then gives up--thus "Failed".
If a file was really deleted at MC, it says "File not found" or something similar, and doesn't give a single link anymore. And that's very rare.
You can get 12 hosts without registering at MC.