Gmvault - Backup the emails in your Gmail account.
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
MailStore - MailStore Home - A 100% free single-private-user desktop solution
imapsync - Console-based utility for migrating IMAP mailboxes.
CubeBackup - A Self-hosted backup solution for Google Workspace
Piler - Piler is an open source email archiving solution with all the necessary features for your enterprise