Why it can happen?

The client may accidentally choose another template or reset existing template to default one in website builder. Note, that this action removes current client's project. However, there are two methods to restore it.

Two options to restore a reset website

1. Open website builder for this website, expand "Publish" menu and choose "Backup/Restore" option. Switch to tab "Restore". There you may see some auto-saved backups of earlier website state saved. Try choosing the oldest one and click "Restore" button. After that check if it has been restored.
2. If website cannot be restored via the first option, but you have correct live published website, then you can restore website in website builder from published website. Take following steps:
• Empty client's folder in website builder that holds client's current project data/e/x/example.com/ (where client's domain is "example.com" and part "/e/x/" is 1st and 2nd domain's letters)
• Copy folders "sitepro/dat" and "sitepro/gallery" into client's project folder in website builder, so that copied folders are located in:
• data/e/x/example.com/dat
• data/e/x/example.com/gallery
• Update permissions of copied folders if needed.

Once done, you should see last version of client's published website in website builder when reloading it.

Note: that even if the reset website was published, then you may try to firstly restore client's account on hosting to an earlier state where the live website was correct, and then restore website in website builder following steps from the second option.