How do you stop knowledge walking out the door when someone leaves your company?

We recently had someone leave our team and realised how much knowledge was stored entirely in their head — processes, contacts, how things worked.

We scrambled to document everything before they left but it was chaos.

Curious how other SMB owners handle this:

• Do you have a proper knowledge base?
• Do you use Notion, Confluence, something else?
• Or does everyone just ask each other and hope for the best?

We're currently exploring whether AI can help capture and surface this stuff automatically — would love to know how others are solving it today.