Originally Posted by Rgb
Again, I recognise that for mass, multi-TB storage, individual 4.3GB discs are a hassle in handling. But that's a separate issue vs. long term viability/reliability/simplicity/cost per GB issues.
It is not really a separate issue as it's part of the decision process when choosing a type of media.
There is nothing wrong with the way you are doing things (with all the precautions you mentioned), it's just not very practical for myself and I dare to guess most other people and it doesn't provide any fundamental advantage compared to the way I back up my movies.