How to backup emails to the clouds?

Question

Backup

Hello everyone, there is a task I don’t know how to solve it.
If a letter gets into the mailbox, then it is automatically backed up to the clouds, how can this be implemented?
And what service

Answer 1

Set up your own server, set up a bunch of SMTP + IMAP/POP, store mail in the maildir format and synchronize it to any cloud storage, for example, to MEGA using the megatools utility set.

Answer 2

or, for example, a Google, Yandex mailbox and send copies of all incoming letters to it