I used to be an Apple service technician. We kept an old mac that had SCSI in an expansion port and Ethernet in another for precisely this reason.
I once transferred all 20MB of a Mac Plus hard drive, an author’s lifetime work, to a new iMac with this method.
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That's pretty delightful, to think of someone using a computer as such a pure tool like that (as opposed to a distraction machine as is so often the case).
I like to imagine the author finally hit the limit of the 20MB hard drive, then decided, "you know what, rather than put 2 spaces after periods, I'll replace them all with a single space like the kids do", saving 400KB, and making room for at least a couple more weeks of work while shopping for a new computer.