Offboarding a client from Provider section

As an MSP, I understand how to offboard a client from our MSP provider section, but how does a client do it themselves? Client wants to know, if they ever break off from us as our client, how can they disconnect their firm from us? Maybe the MSP goes out of business without offboarding them.

This question looks to be unanswered. We have a client asking similar questions.

Can anyone comment?