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imapsync is my personal favorite approach to this problem.

In addition to imap -> filesystem backups it supports synchronizing mail in both directions. And both source and destination can be remote systems.

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The imapsync page https://imapsync.lamiral.info/ states "imapsync is not suitable for maintaining a synchronization between two active imap accounts while the user is working on both sides. Use offlineimap (written by John Goerzen) or mbsync (written by Michael R. Elkins) for bidirectionnal (2 ways) synchronizations."

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