Oh I see. In that case Nostrgram keeps your history of follow list. You can restore from there. Everything else you can broadcast to different relays for backup so that if one goes down you can sync from others.
Discussion
I think that’s for if a glitch causes you to unfollow or lose followers. You’d have to be able to download the following/follower list to really restore to a new npub should you lose access to the existing one as you can’t force the refollow