got-your-back uses Gmail's API instead of IMAP with an insecure app password, which is a discouraged way of accessing Gmail and will eventually be phased out in favor of OAuth access tokens over IMAP (in fact, I thought it already had been).
As for other services beyond Gmail, there's not a great ecosystem for exporting.
For one-off exports, Google Takeout is decent enough, although there's a lacking ecosystem to import the big .mbox files back to an email provider.
As for other services beyond Gmail, there's not a great ecosystem for exporting.
For one-off exports, Google Takeout is decent enough, although there's a lacking ecosystem to import the big .mbox files back to an email provider.