I use Clip Browser to split the BPAV from 16GB card to back up to DL-DVD. Not needed for 8GB cards.
Clip Browser 1 had an issue that when selecting 8GB as the split point for DL-DVD it actually split it at that point. Unfortunately DL-DVD holds about 7.9GB (I think 7.95 actually).
Clip Browser 2 now has a DL-DVD selection in the pull down when splitting which, although shows a ghosted 8.5GB, which is what you’ll see DL-DVD labeled as, actually does split at 7.9GB (so far I’ve only tested this a couple of times though)
What I do is first use Clip Browser to copy the file on to my hard drive. I then split that BPAV into 2 as per above and back those up to DL-DVD.
I use Verbatim 95123 hub printable. Not all DL-DVD are the same BTW so get only “pemium” rated DVDs. After archiving to DL-DVD I print Client name, shoot date, disk number if more than one, format (MP4 but there have been times it’s MOV and I also use AVCHD for one such camera we use).