Excluding existing archiving sites, do you have an expectation or think that data stored on lemmy should be permanent? E.g last 20+ years. Would it matter if old inactive content was culled? If you had the ability to export data if a sever was due to go down, what would you actually do with it.
I think systems have their moment and it’s not a bad thing if (social) content is lost. The ability to manage your own content / solid etc is most desirable if feasible.