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just 8 hour backups... what does that mean? that they keep their backups only for 8 hours? that must be the most stupid backup policy i have ever heard of then. the whole purpose of a backup is to store a snapshot of your site, not to keep a mirror online for 8 hours...
ok, your sites may not be lost afterall, what you need to do is restore your files. lets hope the database was untouched. get the latest version (2.0.13.1) and copy the files to the server (but keep the original mainfile.php on the server, don't overwrite that!). then try to login.
herko