alt Hacker NewsI think you are underestimating the supply chain problem. You can't stand up extra servers you don't already have in extra data center capacity you don't already have. The whole point of the cloud is that you don't have these assets.
While you can acquire these assets the lead times would be several months at a minimum, and probably years if everyone is trying to do it at the same time. It isn't an issue of knowhow, the required physical infrastructure doesn't exist.
Say Microsoft/Google/whatever my local municipality is using right now, gets blocked tonight, and tomorrow everything US-related is offline. It won't (and can't) take months for them to get one server up and running for them to continue with their administration. As mentioned, other municipalities in the country already are 100% independent, running everything themselves, either they're willing to help out the rest of us, or at least provide expertise enough so we can. Then the country is filled with FOSS nerds like myself, who wouldn't shy away from stepping in to help either.
Probably the larger cities would take longer to solve, but I don't think "We cannot get server hardware from the US" will be the biggest problem, it'll be around national organization until the biggest fires been put out. Putting one server in each ajuntament would basically be enough to get 80% of the local municipalities up and running again.