The single domain here is a ccTLD, and DNS's heirarchical nature means your personal domain's redundant DNS can't mitigate an outage at the ccTLD level.
Sorry, no. I was responding to "I am reminded of the warning that zonemaster gives about putting your domain name servers on a single AS, as is common practice for many larger providers."
That is not the ccTLD, that is an individual domain and its name servers. I recall being given that warning for early domain registrations.
Is it more or less than the F-root server run by ISC?
* https://www.isc.org/f-root/
If you want, you can even request your own instance (a 1U Dell):
* https://www.isc.org/froot-process/
Or an instance of ICANN's L-root server, also 1U:
* https://www.dns.icann.org/imrs/
Would .de have more, or less, traffic than some of the root servers?