I've been self hosting for years. Currently using online.net secondary DNS service as my 3rd or 4th backup NS. They've lost my 10€/month box once (shitty cheap

I've been self hosting for years. Currently using online.net secondary DNS service as my 3rd or 4th backup NS. They've lost my 10€/month box once (shitty cheap intel avoton hardware with everything soldered on I suspect) but the domain still resolved fine. I had backups and restored it in a day. You can also use a VPS image to self host DNS. Some providers offer automatic or manual snapshots. Hetzner comes to mind. They've annoyingly asked for a copy of my id card (welcome to Germany), but their services are fine.