Not every note is important enough to be kept over nukes
Remember, not your relay, not your data retention policy 😂 Nostrsync.live is a backup tool created by nostr:npub1cmmswlckn82se7f2jeftl6ll4szlc6zzh8hrjyyfm9vm3t2afr7svqlr6f for making backups of your Nostr events and rebroadcasting them out to other relays. 
Discussion
no. some are. and that’s reason enough to make a backup.