I wish to use a mail client to continuously backup my Gmail data. However, I want to prevent the client from making any changes to my Gmail.
When I tried to access Gmail using Thunderbird/IMAP, in the OAuth2 login screen, I was warned that Thunderbird can change my emails and delete stuff. There was no option to edit those permissions.
A while back when I used Windows 10, I tried its mail client to access Gmail and had the same problem.
EDIT : The backup must include Chats. Chats are not downloaded by POP clients. Also, it is desirable to also include drafts.