Ever make a bunch of edits to a map in ArcGIS Online, only for an errant mouse-click to navigate your browser to a new page before you can save edits, and you lose all your recent changes? Well I just did. (Again.)
Simple idea - have AGOL auto-save edits being made to a map.
Alternative idea - before navigating away from an AGOL map, have a browser pop up that verifies whether you really intend to leave the page. I've seen this "Are you sure you want to navigate away from this page?" pop up on other websites. It'd be an easy stopgap against sloppy mouse clicks.