Long-term, and this may come as some surprise, but make a copy on VHS or S-VHS or even Mini-DV tape (and with Widescreen SD or HD content, record it in the “squished” 4:3, don’t do a letterbox recording). I’ve made DVD-R’s and stored stuff on hard drives and I’ve had them fail within 6 years, whereas I’ve still got VHS tapes that my parents gave me back in the 80’s that still play fine.
VHS may be considered by some people to be dead, but at least if you couldn’t access your HD or digital files at some point in the future, you would still have a copy of your work that you could use. I would even recommend that you get a S-VHS VCR and record your VHS copies through S-Video to get the best quality on your VHS recordings.
