Based on a recommendation from Laurence I bought Sony's VRD-MC5 Multi-Function Recorder to backup the Memory Stick video from my CX7. I have to say it is a pretty slick device and delivers my AVCHD backup Holy Grail: Playable and editable AVCHD formated files archived on a DVD. And 1-touch to boot.
The resulting DVD has the video files in .m2ts format stored in a BDMV file structure.
But it does seem to have one defect that I'm curious if anyone else has seen: All the files on the backup DVD are dated December 31, 2006 at 4:00. My CX7 has the date and time set correctly and the files copied directly from the Memory Stick in .mts format within an AVCHD file structure are dated correctly.
I don't see anything in the VRD-MC5 setup that would fix this problem so I'm just hoping that it's just something I've overlooked.