I'm not sure if what you are asking is correct but I usually backup /opt/sark/db/sark.db manually after every change I make, new extension or trunk etc. If you then reinstall SME and SAIL you can copy this to the same location and your extensions etc. will be there. Only problem I've had is the permissions need changing if you use WinSCP to copy it across, you can use the chown command to do this.
I hope this helps.
Regards,
Del