Does Snap Backup have a restore feature?
Eventually a restore (unzip) capability might be added to Snap Backup, but for now you’ll need to use one of the numerous standard zip utilities, like gzip (gunzip), 7-Zip, The Unarchiver, or Mac’s built-in Archive Utility. Your computer probably already has the ability to open a “.zip” file by simply double clicking it. Hopefully, you will find restoring to be an infrequent activity.