The solution to Bitrot and reading of old media is very simple and honestly I don't know why it comes up so much. Storage is DIRT CHEAP. 2TB of Data is NOTHING, you can get a 3TB+ external drive for $100 or even less on sale. Buy 3 drives, keep 1 in SAFELOCATION*, Back up to 1 drive every even week, and the second one every odd week, and once a month swap the one in the SAFELOCATION out for a local one and repeat the cycle. Increase or decrease frequency of SAFELOCATION swapping depending on level of paranoia.
There, the problem is simply and very cheaply solved and there is no level of bit rot that is going to cause all 3 of these backups to be destroyed within a 1 month time window.
* where SAFELOCATION is a off-premise location, either a close friend's house or a locked office desk or a family member's house or a safe deposit box