How to download/save/backup onenote after leaving the organization?

I originally made my onenote with my university associated account, and would like to continue to access and backup the data in case anything happens. 

I've shared the onenote to a personal account I've just made, but does this mean even if my organisation email/account is deleted, the onenote is still available on my personal account/email?

Is there any way to download the information on onenote and save it locally? I'm running macOS 12.2.1

Thanks!