Each time you make the map editable, a backup of the map is created automatically. You can revert to the backup version by choosing Revert... from the Edit menu.
When you make a change to a map, the change is saved immediately, automatically, every minute or so.
If for some reason you want to make changes to your map, but you want to be able to get back to your original version if necessary, you can make a backup of your map.
When you make a backup file, it stores references to your original chart data. If you decide to restore a previous version, your chart data remains available.
To make a backup:
Note: Backups are stored in the InterMapper Settings/Maps (Backups) folder.
Use the Restore... command, available from the File menu, to restore a previous version of a map.
To restore a previous version:
InterMapper creates the following backup types: