It’s a bit of work but here’s one way of doing it:
- Make a full system backup of your original CE installation.
- Copy the backup file to a USB Flash Drive
- Create a second SD Card with a fresh CE installation
- Remove your current SD Card from the Media device
- Insert the SD Card with the new CE installation into the Media device
- Boot the Media device via the recommended method (toothpick, etc.) into the new CE installation
- Restore the backup from the USB Flash Drive
You should now have an identical copy of your original installation.
Hint; technically, all you need is the backup file.
Alternatively, you can try shadowmaker or backupper.