Horcrux lets you automatically backup your mails from any IMAP supported accounts (Gmail, Microsoft Exchange etc) with great ease.
Available on the Mac App Store
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Horcrux does backup emails from your account. It also helps you restore these emails into any other IMAP supported email service.
The backups take place silently and unobtrusively in the background. Once you have set it up, you can sit back and relax!
Horcrux allows you to export backed up emails in .zip format, so that you can use it in future whenever you need, wherever you need.
Horcrux supports multiple account backups. So, now you can manage backups of all the accounts under one roof.
Horcrux, along with emails, backs up all the other data like labels and tags associated with it. So, you don't have the trouble of organising your mails again.