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Updating a site never erases what came before. Each update is saved as a version, so you can always see the history and go back to a version that worked. Version history is available on Premium and Team.
Every time you publish or update a site, snaphost saves that state as a new version, with the date and size. You can look through the full history of a site whenever you need to.
Made a change you want to undo? Roll the site back to any earlier version. The rollback is saved as a new version too, so you never lose anything and can always move forward again. The site keeps its link the whole time.