I must admit that when I went back to the relays option after some updates of Amethyst I got quite confused. I'm still not sure my setup is fully optimized but at least I more or less get it now, thanks.
Have you chosen 1 or 2 home relays that MUST have all your posts? That's the first step.
How does one do this step?
Find your 2 favorite relays and make sure they are not going to delete your data.
Is it simply connecting to those relays or are there additional steps?
Just adding to the list. The app will make sure your data is there. Not so much for the others.