What happens to 301 redirect if the site taken down?

[Marvellous]

I understand 301 redirect carries over the page value to the page its being redirected to. However what happens if for example, I do a 301 redirect from example.com to example.co.uk, 2 months later I take down hosting and cancel domain for example.com, would I lose the page value that was being carried over to example.co.uk? Do I need to keep both domains active?

[TheeDigital]

Yes, it would be lost. Yes, you should keep it active.