[latch]

Yes. You can do master-slave with AXFR but it doesn't seem very well supported nowadays. I remember 1 provider that let you put in your AWS credentials and they'd sync to Route53 using the API, though I can't find which one right now. Different providers offer different solutions...a lot don't offer anything.

Of course, you can always do it manually..which is fine if you have few records and they are static.

edit: Kept googling and I did find http://www.dnsly.net/ neat enough that I wanted to share it, even though I think dns providers should be doing this as part of their existing packages.

Also, although it's no guarantee, dns providers that use anycast are less susceptible (but not invulnerable) to ddos.