I use primary for livetv and backup or external for vod/tv series
backup is a default setting for vod/tv series and primary is default for livetv
why mess with default settings?
I'm pretty sure buzz set epg to the tz on your device so even if that service went back to pst it wouldn't matter because when that happened I had to change from -3 to current even though server epg was -3 for me