Saving Pages While Editing?

Is it possible to save your progress as you edit pages in Roll20 so that if you make a major mistake, you could go back to a former saved copy of the page?  I am fairly new to the program, and it seems to me that if I make a big mistake (say, I accidentally delete a major component on the page), I end up redoing a lot of the work.  Am I missing the save feature? Or reload previous version feature? Or does that not exist?

Ctrl+Z will undo errors as you make them. This includes deleting something accidentally from the map. Otherwise, there is no save feature. Any work you perform on your campaign is automatically stored on Roll20 servers. Backups are made daily so if a game gets corrupted for whatever reason there are multiple backups. If necessary the Devs can restore a corrupted campaign that way.  If you have specific circumstances you are wondering about I can give you more specific advice. However, if you do want to back up everything at a certain point you can always use the copy/extend option on the Campaign Details page. - Gauss