Masterblaster and Sheldon, are you familiar with the software FD ISR?
Well nis4 has basically set up his system (using Rollback) to work the way FD ISR does (I'm not sure if he realizes this?). The difference being that Rollback gives the superior option of still being able to make incremental snapshots of each individual setup (or main Snapshot). This is what i tried to convey in my first post to this thread.....but nobody seemed to see the fantastic potential of this idea (not even Horizon).
I think nis4 is making great use of a technology that initially probably wasnt meant to be used in this way but if you really think about it its perfect for this kind of setup. You can branch off a new main system from any snapshot of any existing "Main snapshot" in about 3 secs. Can FD ISR say the same (I'm not having a go at FD.....I'm just making a point at their expense

. Sorry).
Anyway, nis4 I think its a clever way of using Rollback.

. The only draw back as you've already stated is that only one snapshot can be kept if you wish to upgrade, resulting in the loss of all but one of your "Systems". If you read my first post to this thread, I did ask Horizon to consider a more userfriendly approach to this way of using Rollback but i think it fell on deaf ears.

. Such a shame...