Terrific! Worked great!
Now I don't have to concern myself with whether or not I remembered to remount volumes...
When checking SD! schedule and logs after doing test backup I did get an error on SD start up:
"SuperDuper! cannot find target volume "(null)". Please attach or mount the volume named "(null)". If you can't find this volume, or it was erased outside SuperDuper!, click Cancel."
Clicking "cancel" brings you to the SD panel with everything greyed out.
Don't remember having this problem before. Could view the schedule even with volumes unmounted (I think?) Anyway, not a problem since mounting the volumes again brings everything back to normal.
Thanks for this, J