While making a digitalized copy may be wise to insure against complete loss of the origina l, in the past we've seen far too great a reliance on the digital copy, with a tendency then to neglect the analog original. Don't let that happen!
As time goes on, we're gradually able to extract more and more improved images from old magenetic tape. Such later extractions are often far better than earlier extractions. If we discard or neglect the original, or equipment to read it, we can have a bad case of buyer's remorse.
Preserve your analog assets!
HF
Good luck keeping a 50 year old B&W 2" Quad machine running for the next 20 years. Even if you do, good luck keeping a 70 year old magnetic tape from shedding all of it's oxide as you attempt to play it back.
Nowadays, you can extract the information from an LP using nothing but a laser, so it may be possible in the future to have an equally non-contact method of recovering the magnetic information pattern from tape, then process it digitally. But keeping the original machines to read the stuff is not feasable.