I do not remember if it was on this site, or another one. I auto save my iweb file on a "cloud" service. Personally I use Insync with my google account.
This saved me when I recently had to reload my mac os after being stupid and deleting a program I thought I no longer needed (mac mail).
Turns out mac mail is the best way to go if you want to sync your email and calendar through google apps. That is a different conversation for another time.
I would highly recommend uploading a copy of your domain file to your preferred cloud service and have it on hand for back up or multi computer use.