Resiliency of the DNS

We have a DNS zone lies on the NIC, not so long ago NIC was falling, before website no one to reach out could not, mail not working well, etc.
The idea to add in the zone NS record on the DNS server yandex', and Yandex'e pens to register all records with NIC.
Because NS records are filed with the Registrar of your domain, and not on the same hosting (I hope), when you drop one DNS server, the other will have to answer.
The question is, will this system even work? 8-)
And second, check in Yandex'e required to create a record @ MX 10 mx.yandex.ru., and we already have such an entry for their mail servers. Whether it will lead to problems with mail?
October 3rd 19 at 04:22
3 answers
October 3rd 19 at 04:24
Primary name server with all the records on the zone can be only one, but the secondary (secondary) may be several. Handles to prescribe nothing, the secondary servers themselves will load the zone from the primary and will update it when changes in the primary (on the primary only need to register the IP address of the secondary, so they could load the area). At the same NIC.ru there is a service of providing secondary DNS servers in different geographic areas, this service is almost all registrars, if you need additional insurance from the global collapse NIC.ru (which is rather unlikely). You will need only to register secondary servers with the Registrar of the domain name for your zone (add NS records to the existing).

As for the second question, decide first for yourself where you want to accept mail — in or on yandex'E.
October 3rd 19 at 04:26
On the second question: no problems, it is possible to register your mx
October 3rd 19 at 04:28
Create an MX record is required if you want to place the mail on Yandex. In your case, if you use your server for mail, then of course no other entries are to be added.
More on the DNC Yandex (if your scheme will work) it is necessary to change MX records on your.

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