Hmmm. Are my messages getting written only on the relays I’m connected to? Where is my profile stored?
No. The relays hold the information. So let’s say you went on https://nostrgram.co/ and signed in. If the relays are different it won’t have all your profile info. Or if you delete one of them you might loose some stuff.
Discussion
Yes. That’s why some of us choose to have quite a few. Some go offline occasionally. Your profile and everything is in the relays.