Storage media
The many 5.25 and 3.5 floppies I have from the 1980s/90s are still readable today, whereas several CDs I burnt in the noughties now give read errors or won't mount at all. I like the robustness and reliability of old kit. The 486 which houses the 5.25 drive and two IDE hard disks running DOS and Win 3.11 is still going strong, although it could do with a new CMOS battery to save having to enter the date & time whenever it's powered up (not often!). I keep it for running old games and other stuff which works best on real hardware. It came in useful a few years ago when a colleage needed to retrieve some software from 5.25 disks.