I think regular archiving plans are likely one of the most overlooked features in systems design. The most inefficient method I ever experienced was when we had no option but magnetic tape, often had to retrieve multiple reels, mount them, and do sequential searches. Archive creation involved device to device merges adding new data from production discs. What a PITA that was.
At home I use a combo of active disk, a NAS storage device, a number of USB drives, and a case full of DVD-RW for what is now a collection of 36 years of data. Anything prior to 1986 is gone, and that could be a good thing.
Some additional thoughts on this: I'm digitizing thousands of B/W family photos up to 100 years old, and thousands of 35mm slides, and have done some reading on the life span of various media for data storage. There's nothing really definitive, but it sounds as if the current magnetic storage media should be refreshed every few years just to be safe, and of course we need to consider the continued availability of the devices themselves. I did find that the failure rate on several hundred old floppy disks was about 40%. Fortunately there was not much I really wanted on them, but did want to review before trashing them. And yes, at this point you CAN actually find 3.5" floppy drives in USB.
One of the best days of my IT career was they day I told my boss if the problem was so simple he should go fix it himself.