So, if I were to create a backup (Backup A) and then create a handful of new asset accounts, journaling balances from existing accounts, what would happen when restoring Backup A? Nothing? The new accounts would be reset to a $0 balance but remain in existence? By way of a reversing JE or a deletion of the JE? 

How are we "restoring a snapshot" if what was created after the snapshot remains in place--this doesn't make sense.