I confirmed my 'volume snapshot policy' for 'none' was -enable=false.
... and yes, these snapshots do seem to line up with the confuration backups that are occuring. Hadn't thought of that.
However, while not a big deal, I've got a pair of clusters (both installed as 8.3.2) and I'm watching and comparing vol0 snapshots and sys-conf-backup settings. I'm seeing one system tending to retain just one of these named (.tmp.bk*) snapshots while the other one retains up to 6 I think (2 of each kind: 8hour,daily,weekly). However, I'm gonna keep watching it as I played around with vol0 size yesterday after getting some aggr0 space-util alerts that look like they cooresponded in time to when these backups run. Could be the backups where aborting and not cleaning up snapshots.
Thanks.