You have to convert to an archival format from whatever your raw format is. The issue with raw files is that they are compressed so any bitrot in those leads to more than just losing a pixel or two here or there but sometimes the entire file. TIFF is not compressed at all. FEC allows single pixel corrections to be done accurately. We had a metric shit ton of LTO tapes, changers and online disk cache that handled all that.

I don't do that at home. I have 600GB of Nikon raws. I keep one copy on my Mac. I have a time machine backup in the house (in another room) on an Samsung T7 shield and I have an off site backup which is a quarterly rsync job to another Samsung T7 shield.