I already have the local pihole setup (with Google Upstream DNS Servers) working by setting pi local static ip address in router DNS servers.
but sometimes when pi is down (power/network issues), for fallback Can I use NextDNS DNS Servers in DNS Server2 in router settings?
If you do, your network clients may (and many times will) decide to use NextDNS instead of Pihole. Which one they pick is a guess at best.
If you add a second DNS it will work even when the first one is active.
For most operating systems this is not a "fallback". It is just an alternative DNS.
If you really wants a fallback/backup you can add a second Pi-hole.
Having only one pi-hole on a Raspberry Pi, running for years, I can say that investing in some form of UPS has greatly offset the need for other 'redundancy' measures. I have never had an outage, other than one caused by my own 'tinkering'. Ensuring your OS, and the pi-hole running on it, shutdown and restart properly does wonders for long-term stability, IMO.
Agreed, same here. The only outage I have is electricity (and if it's long enough for the UPS to go out, I've already shut everything down gracefully anyway) or the ISP in general; if that's down, an alternate DNS provider isn't going to help.
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