@freemo An archive from 2018 (which I left Fedi from frustration) was similar .tar.gz compressed file with a .tar file inside (so another compressed file) and then uncompressed that has JSON* files inside as listed below...
actor.json
avatar.png
header.png
likes.json
outbox.json
*not sure if names of things have changed since then and seemingly didn't have any media saved - hmm...
Regarding potential spam on any importing (if you could) - Yeah I was thinking how the spam would be managed, but then I thought simply "how about muted import?" so imported posts would show but unannounced (seems possible but perhaps not across all software).
But overall anyway I assumed INcorrectly and was wrong - so you can't move posts at all top another server and perhaps only save them locally and read them by "Activity compliant software"... wherever / whatever that is!
❓ Anyone have a clue about "Activity compliant software" ❓
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