I am specifically asking about software and needed libraries, not stuff like Wikipedia or the writings of Ernest Hemmingway.
To keep people from archiving all of github on thousands of shucked external hard drives cobbled together all Frankenstein-y to create a postapocalyptic data center assume a ~1TB storage limitation. Though I’m sure that person exists here on Lemmy somewhere :D
FreeBSD ports with distfiles for things really necessary, with dependencies. I guess that would fit in 1TB and leave some for ebooks and music.
Also software RAID is not Frankensteiny at all, neither are storage clusters of Ceph or alternatives.
What those things necessary would encompass, I don’t know. I suppose similar to Slackware full installation.
It would all make little sense without the Internet. You’d suddenly find that a year 1995 machine, one year older than me, and a few friendly BBSes are not as unrealistically small as they seem now.