Since I started to use CompactFlash cards with a PCMCIA adaptor in a PB1400 some years ago, I use CF and SD cards with adapters and card readers as a preferred removable media on any kind of computer. For old Macintosh computers I use an Adtron PCMCIA card reader in an external SCSI enclosure. More recent machines sport a PCMCIA card reader, USB or even more recent slots for flash storage. It just works reliable and fast, uses little space and I do rarely run into compatibility issues. Media are cheap and available from running production. I agree that a network connection would be even more convenient in many cases, but removable media work around elegantly around many issues you might encounter when trying to set up a mixed network with components of recent make and other components from the beginning of the PC era.

ZIP, MO and SuperDisk drives and media are still at hand, but I did not use any of them for years.