C:/Users/<user>/FormIt/MyProject.axm, the backup file can be found at
C:/Users/<user>/Documents/Untitled.axmb. Once you save the new model to a different location, the backup will start adding unsaved changes next to the new location, as noted above.
.axmbfile from the file explorer to open a backup.
.axm) to overwrite. You cannot overwrite FormIt backup files (