How to make a backup in the local network?

Question

Cisco

There is an L3 switch, eight L2 switches are connected to it, each of which is connected to 10 PCs. That is only 80 pcs. How to schematically organize a storage network in cisco 7 with the condition that in case of problems, the backup time should be adequate?

Answer 1

1. In case of what problems?
2. What does adequate mean? What are the requirements?
3. And here cisco?