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Well gmail has 99.987% currently but only 99.9% is promised according to SLA. https://support.google.com/googlecloud/answer/6056635?hl=en#zippy=%2Chow-reliable

• another-dave 6y ago
  And Protonmail offer 99.95% according to theirs (as of 2018, latest info I could find) — https://protonmail.com/blog/protonmail-reliability-sla/ https://protonmail.com/blog/protonmail-reliability-sla/
  • pmlnr 6y ago
    99.95% is a high standard already: 365x0.0005x24 is 4.38 hours outage for a year. In our current world, 4.38 hours is certainly not enough time to, say, rebuild a DB from backup, if needed.
    • throwaway81523 6y ago
      Yes, you fail over to a hot mirror, or if you really have to rebuild because something went nuts, do it from a recent snapshot.
    • another-dave 6y ago
      Yeah, especially when they're saying it's calculated on a calendar month, so you can't even "draw down" on previous months with 100% uptime if you have a serious outage.
      • cf_ 6y ago
        Yes, but I assume the rationale here is that they will only have to refund that month and can reset the clock for the next month. So if they have serious downtime it won't cost them for the full year - just for that one month.