IMAP allows you to have multiple synchronized copies of the entire mailbox. And you can depend on multiple email servers (and IDs) if the mail server is unrelia

IMAP allows you to have multiple synchronized copies of the entire mailbox. And you can depend on multiple email servers (and IDs) if the mail server is unreliable. Email has fewer single point failures. Git may help you backup code against failure of Github/lab. But it doesn't prevent you from losing ability of issue PRs or accessing issue trackers.