Unless you expect to 're-interpret' your RAW files indefinitely into the future, you could simply output TIFF or JPG files. Burn them onto media and then every few years copy them from one device to some different technology storage unit, to keep up with the evolution of hardware
...and do so before the old storage unit can no longer be interfaced to the current PC hardware. If digital images had existed in the days of the ST-506 harddrive in the 1980s, you would be hard pressed to plug in an ST-506 into a PC of 2017, and so your ST-506 harddrive data would be inaccessible.