Local understudy of the project, relevant?

Question

Work organization

Good evening, Khabrovites.
There is a project to service one company. We do everything directly in the cloud.
We simulated a situation when the Internet drops -> the work of the entire office will stop.
Unaffordable luxury.
We came to the conclusion that you need to make a server inside, local.
If the Internet cuts, we launch our devilish machine and workers have access to everything they need.
The following is of interest in this regard:
1) Are there any mana for the correct organization of the entire food chain
2) Examples, interesting articles.
It would be interesting to read about systems like them: do they take root?

Answer 1

Google "replication", "master-slave", "split-brain"
No, your devilish machine must be running all the time.