gnus: Archiving Mail
6.5.1 Archiving Mail
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Some of the back ends, notably ‘nnml’, ‘nnfolder’, and ‘nnmaildir’, now
actually store the article marks with each group. For these servers,
archiving and restoring a group while preserving marks is fairly simple.
(Preserving the group level and group parameters as well still
requires ritual dancing and sacrifices to the ‘.newsrc.eld’ deity
though.)
To archive an entire ‘nnml’, ‘nnfolder’, or ‘nnmaildir’ server, take
a recursive copy of the server directory. There is no need to shut down
Gnus, so archiving may be invoked by ‘cron’ or similar. You restore the
data by restoring the directory tree, and adding a server definition
DONTPRINTYET pointing to that directory in Gnus. The 
Article Backlog, *note Asynchronous Fetching:: and other things might interfere with
overwriting data, so you may want to shut down Gnus before you restore
the data.
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