there should be relatively simple options to back up pretty much any app. Outlook or Windows mail?
https://www.dell.com/support/kbdoc/e...rosoft-outlook
https://www.techwalla.com/articles/h...a-new-computer
I use Outlook for all of my mail accounts and they are all saved as webmail as well as Outlook so I never have to worry about mail
Even Virgin mail stays on the server as long as you set it all to mirror and not just download