Comment by Imustaskforhelp

100% absolutely but its a bit worrying if in the future multiple AZ/datacenters could be start to get targeted?

attacking datacenters within a particular region so that service would have a hard time.

I guess someone can use some other regions DC to have more than (regional?) AZ but for mission critical infra, I can see that having sometimes issue too and you genuinely can't predict any of all of this.

That being said, There should be more than one AZ reliance but IMO also off-site or multi-cloud backups should also be preferred/used as well.