I want to archive almost all of my email in MH mail boxes to an external disk. 
The idea is to free up space in the running disk. 

I thought I could just move ~/Mail to external and start with a new empty Mail 
directory, but then I realized I want to do incremental backups in the future 
and I have no idea how to do that. The MH format relies on message file names 
which are numbers in a sequence. If I just start with an empty directory (and 
there are many directories, which become "folders" in mutt), new messages will 
be named/numbered 1, 2, 3... all over again. Then I won't be able to just add 
them to the master backup with rsync.

MH also has .mh_sequences files that manage what messages have been opened or 
replied. I see no way of syncing that information either.

Any ideas?

Luciano ES

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