Remember: Your Zen Cart store consists of two major components: the "files" (PHP files, image files, css files, etc) and the "database" (which stores all your products, customers, orders, etc).
If your admin shows all your products and customers and orders, then I suggest you do a fresh database backup BEFORE you ask your hosting company to restore an old backup.
Database Backup instructions: https://www.zen-cart.com/tutorials/index.php?article=103
File Backup instructions: Use your FTP program to copy all the files from your site server to your PC
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Remember: Any code suggestions you see here are merely suggestions. You assume full responsibility for your use of any such suggestions, including any impact ANY alterations you make to your site may have on your PCI compliance.
Furthermore, any advice you see here about PCI matters is merely an opinion, and should not be relied upon as "official". Official PCI information should be obtained from the PCI Security Council directly or from one of their authorized Assessors.