If the client ruined his website only in site builder whereas the published version is still correct, then inform us about it in the ticket and our team will restore client's website in the editor from published version.
If the client published ruined website to hosting, then the only way to restore the correct website version - is to restore account backup on used hosting control panel (cPanel, Plesk, etc..). After you get correct published website version then inform us about it in the ticket and our team will restore website in the editor.
For On-Premises brand only:
Provide us FTP or any other access to published website files, so that we could use them for website restoring in builder.