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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 pointing to that directory in Gnus. The
3.14 Article Backlog, 3.11 Asynchronous Article Fetching and other things
might interfere with overwriting data, so you may want to shut down Gnus
before you restore the data.
It is also possible to archive individual nnml,
nnfolder, or nnmaildir groups, while preserving marks.
For nnml or nnmaildir, you copy all files in the group's
directory. For nnfolder you need to copy both the base folder
file itself (`FOO', say), and the marks file (`FOO.mrk' in
this example). Restoring the group is done with G m from the Group
buffer. The last step makes Gnus notice the new directory.
nnmaildir notices the new directory automatically, so G m
is unnecessary in that case.