how to make a cache server for a vultr vps?

Hail to the hosting master of LET, this community taught me well, but i am stuck on something.

How do I create a local cache server at our office for my main WordPress site hosted with vultr.

what term do I search to create something like this?

mainly I have about 200ms ping with my site server, so I want to host a box at my office which will run 24/7 and serve sites near me, when its down people can still access the vultr box.
i feel its possible just need the right keyword to learn this.

thanks in advance.

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