In theory MAM-A Silver or Gold CD-R media, but you'd need to check if they (still) are really archival quality. I didn't way back when because Taiyo Yuden was judged to be good enough (and that might have been before Mitsui/MAM were making high quality media).
It's also possible there's good Bluray recordable media; I switched to LTO tape instead of going in that direction.
