- SSH to your router. Create backup:
tar -cvzf /tmp/overlay.tar.gz /overlay
- Copy the backup to a safe location:
scp -O [email protected]:/tmp/overlay.tar.gz ~/Downloads
- After fresh install restore the backup:
scp -O ~/Downloads/overlay.tar.gz [email protected]:/tmp/
cd /; tar -xvzf /tmp/overlay.tar.gz
reboot