I recall years ago a conversation about national archives type groups running into the problem of the amount of data divided by the transfer rate being either longer than the lifetime of the media, or longer than the refresh window.

In the latter case you are going straight from floppy to DVD, skipping over CD. In the former case you are doing data recovery operations on aging CDR media. It’s a mess.

And it makes me wonder about the relative speed of disk duplication solutions versus backup solutions. That is to say, if I can produce 3 backups in roughly the same time as one, maybe I should be making mirrored data transfers. And then shipping one to <atmospherically stable location> And another to <politically stable location>.