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It's not so much AWS vs. in-house. But AWS (or GCP/DO/etc.) vs. multi/hybrid solutions. The latter of which would presumably have lower downtime.

I don't see why multi/hybrid would have lower downtime. All cloud providers as far as I know, though I know mostly of AWS, already have their services in multiple data-centers and their endpoints in multiple regions. So if you make yourself use more then one of their AZs and Region, you would be just as multi as with your own data center.

Using a single cloud provider with a multiple region setup won't protect you from some issues in their networking infrastructure, as the subject of this thread supposedly shows.

Although I guess depending on how your own infrastructure is setup, even a multi cloud provider setup won't save you from a network outage like the current Google cloud one.

Hum, I'm not an expert on Google cloud, but for AWS, regions are completely independent and run their own networking infrastructure. So if you really wanted to tolerate a region infrastructure failure, you could design your app to fail over to another region. There shouldn't be any single point of failure between the regions, at least as far as I know.

Why would you think that self-managed has lower downtime than AWS using multiple datacenters/regions?

Actually, I imagine that if you could go multi-regional then your self-managed solution may be directly competitive in terms of uptime. The idea that in-house can't be multi-regional is a bit old fashioned in 2019.

For several reasons, most notably: staff, build quality, standards, knowledge of building extremely reliable datacenters. Most of the people who are the most knowledgeable about datacenters also happen to be working for cloud vendors. On the top of that: software. Writing reliable software at scale is a challenge.

Multi/hybrid means you use both self managed and AWS datacenters.

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