That's true; there are a lot of reasons not to rely passively on digital media for archival purposes. But I'm speaking here even of digital media from the lost, pre-cloud, pre-SAAS age when one could loosely presume to own at least what was on one's computer, but (therefore?) there was no institutional interest in keeping the large variety of media readable. (For example, I joined the Mac ecosystem not long after they switched away from SITX compression, and almost immediately it became--at least for a new user--impossible to find uncompressors.)