Wix has an auto save you can turn on to prevent any loss of your site. At anytime you can go to your site history and revert to any previous version of your site. I’ve never tested it, but your histrory goes back months. You’ll never lose your site data thanks to this feature.
WIX sites are cloud based, and only the individual elements can be exported. The site itself is not exportable.
I hope this helps.
Rich Palmer
Fellow Beta Tester