Unfortunately any Nostr tool you use probably has some potential to do this. Contact/follow backup lists are a cool premium feature idea for clients. Primal has done this and I’m sure others will to. If you don’t want to spend that money can backup yourself, but it is a pain.
Welp. I thought #damus was immune from the follows getting torched like the #primal follows do. But no. I AM ABSOLUTELY CERTAIN that I was following nostr:npub1art8cs66ffvnqns5zs5qa9fwlctmusj5lj38j94lv0ulw0j54wjqhpm0w5 since July, because I did it when I finished his amazing book, The Genesis Book. This was in July. Just saw a post from him, decided to check it out, and I’m damned if I was not following him. So, I don’t give a rip about how many follow my npub, but I most assuredly do care how many/or who I follow.
Discussion
I am #damus Purple. You would think that it wouldn’t go south under those auspices. I just wonder how many npubs see where I have “unfollowed” them and possibly take it personally.