Via Thunderbird, Apple Mail, ...
- Quick and easly solution.
- Drawback: not so stable if you have thousands of emails or a huge amount of folders.
Step by step:
Setup any email client on your computer. F.e. 'Thunderbird' (http://www.mozilla.org/en-US/thunderbird/) or Apple Mail. Configure your IMATH Account.
- Copy (duplicate!) all mails (mark all mails and choose 'copy') to
- a) a local email folder (this becomes your archive/backup), or
- b) a second configured (a free email service like gmail, gmx, ...) email account.
- In most applications, you have to copy/duplicate each folder separately (no recursive copy).
Via imapsync
- Commandline tool - no GUI - compplicate to setup
- Has to be installed locally.
- Very flexible.
- Copies Mail recursively.