Character encoding issues after restoring a managed backup

I used Snapshot Pro to restore a managed backup on a site that had a virus problem (it was caused by a plugin, and I corrected everything).

The site was not accessible, because of the virus entered from the backdoor that plugin created. So I had to restore it manually, uploading the archive and the script through FTP.

So then I ran the steps on snapshot wizard and it succeded. The only problem is that the backup, once restored, messed up pretty much all the text on the site (and also some other minor things, like the header color, it reset the logo, and other things, but those are not important).

The main problem is that there seems to be an issue with the character encoding. Any words with accent were changed with other characters, and so I have all the site that looks like someone typed words randomly… any idea on how to solve that?