GUNTIS Why this couldn't be script we could use directly in SuperDuper? There is possibility to run script before or after cloning. Why not make script which SuperDuper could run to disable Spotlight indexing and then automatically eject that disk?
I found other work-around - I disabled clone disk indexing in System Preferences/Spotlight. Just drag your mounted clone disc icon into Privacy section of the Spotlight options in System Preferences, and it will never be indexed. But if your script could be inserted in SuperDuper!, it would be even better.
(Version 1.0)