Normally you should just re upload the site backup and databases. But if you made only a site backup ( FTP ) it is useless if you didn't made a databases backup. Because you should re upload the databases too.
Hint: Making a site ( FTP ) backup is useless without a databases backup.
Also I really doubt you were hacked. Its probably one of the people you granted access to the administration who did that. A real hacker would have erased all your site and not only downloads.
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