I’ve used lemmy_migrate in the past and it’s good for one-way copy. I’ve also seen lasim, but I haven’t tried it. You may find other options on awesome-lemmy.

Yeah, ISP-related issue is all I can think of. I can connect to the server over v4 no problem, but the broken v6 connectivity to this particular endpoint is strange and nothing I’ve seen before…

I’ve looked at one, but all that I can tell is I stop reaching things somewhere between my ISP and the datacenter the server is in.