I went through a period of heavy conversions, not sophisticated, but accurate enough for my old but good ears. Did Reels, Cassettes, LPs. My old reel-to-reel is probably out of condition permanently, but I think I could manage cassettes and LPs if I had to.

Not aware of any equipment that does not require a computer for the conversion/ storage part.

We are getting past the point when a lot of this is being done and you can expect fresh from the factory equipment to do it. There are plenty of devices around and a diminishing number of people competent to do the work. This applies also to photography/ slide conversion as well.