I apologize for the delay in response I will answer the ones that I can however, I am not an SnapCenter expert.
1. Snapshots actually Just locks old blocks so when restoring from a snapshot the pointers just get moved back to the old blocks and the pointers to the new changed blocks get removed unlocking them.
2. Snapshots are always made in the volume.
3. I am unsure of that one.
4. A clone is just a vserver attached to a snapshot so it doesn't actually take up any extra space. It is only when the close is broken off is a new volume created.
5. see above
6. Snapshots are always in the same volume. I'm not positive on how this works with SnapCenter but i know with snapmirrors and snapvaults you can have a secondary volume that duplicates and or stores extra snapshots from the orginal.
7. I would recommend doing verification as a backup isn't really a good backup until it is tested. Since these are database backups the database and the host have to be "paused" when the snapshot is created to ensure that the snapshot is consistent. Let me know if this answers your questions. I may be able to explain more or it might be time to open a case to get to a snapcenter specialists that can explain better.