Use diagram version control in Dropbox
Dropbox and several other cloud platform providers support file version history. When diagrams.net auto-saves, a new version of your diagram is created.
- Open the diagram stored in Dropbox in the diagrams.net editor.
- Select File > Revision History from the menu.
- Preview the different versions of your diagram by clicking on the tabs on the left.
- Click Restore to restore an older version of your diagram.