I self-host for most things. I live on the edge and don't have backup DNS. For most situations, you'd want backup DNS as well. ns1.kimsal.com ns2.kimsal.com

I self-host for most things. I live on the edge and don't have backup DNS. For most situations, you'd want backup DNS as well. ns1.kimsal.com ns2.kimsal.com nsA.offsite1.net nsB.offsite1.net etc. the kimsal ones are my primary/secondary, but having the others offsite, slaving from the primary, would mean that even if my primaries went down, the info would be at the 'offsite' ones. Those 'offsite' DNS servers would need to be registered with the registrar as well, and become part of your record (you can check that with a whois).