30 years? Hmm.
Collecting habits (I assume you are targeting collectors and not industrial companies looking to keep old equipment running) will change quite a bit over 30 years of scrap machines. You can play the game of keeping everything you find and store it in a government warehouse like in Indiana Jones and the ark but few people have that kind of CHEAP space.
I think parts are the way to go. You can store a ton of CPU's, heatsinks+ fans, motherboards, power supplies, video cards, various floppy drives, sound cards, RAM, hard drives in a small enough space sorted by era as you get them. People will mostly want specific machines that mean something to them and if they can find them in 30 years odds are they will need parts to make them run and that's where the money will be. Look at current power supplies now, a good gamer PS costs a pretty penny but they are heavy on the 12V side which won't help you on older systems that need a large 5V side so an older PS will be needed.
Hoard anything not being made anymore that nobody wants now, basically anything with a PPC chip in it (Apple Powermacs, powerbooks), also Sparc machines from SUN. 68K equipped machines are already starting to fetch decent money after being worthless a decade ago. People will also be shifting their collecting to laptops down the road and few people bother to keep those around (intact). IDE drives of all types are still common now but they will not be in 30 years, same with SCSI (working 50 pin SCSI drives in the 500mb to 4GB range make bank now). Save a few thousand IDE and floppy drive cables. Somebody will probably make a killing saving used and working LCD panels from laptops if you can keep them from freezing or getting scratched.
I have seen a few people with warehouses full of this kind of stuff have to dump it all because of illness so you might want to go in with a few people who have the resources to keep this stuff intact and safe for the 30 years needed before it is valuable to make a decent profit. As far as storage goes keep UV light out (no windows), seal the stuff in moisture proof tubs on dry days (use desiccants in cloth pouches), expect some spoilage and check on the contents every few years.
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