Also, I forgot to mention that NIST offers (and many institutions use) a service that provides a local rubidium reference that is GPS disciplined and they give you monthly reports that tell you the offset of the timestamps that were reported so they can be corrected. These services did not suffer interruptions.

This is the reason GP listed out all the alternative robust NTP services that are GPS disciplined, freely available, and used as redundant sources by any responsible timekeeper.

What atomic clocks are disciplined by NTP anyway? Local GPS disciplining is the standard. If you're using NTP you don't need precision or accuracy in your timekeeping.

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