[MlMt] mail archiving

[aisrael]

My institution politely asked me to reduce by half the amount of space 
my emails occupy on their server (currently 36 Go : given my position in 
this institution, I had to keep ~20 years of emails; I am now 
semi-retired and should be able to “delete” some of them). Therefore 
I decided to archive old emails. I found a lot of relevant suggestions 
in this forum, and decided to test Eaglefiler, Horcrux and Mailsteward, 
but I was not thrilled by any of them, for different reasons. Then I 
thought the simplest solution was to export individual mailboxes under 
the mbox format. This works well (I am using Mailmate 5937). Then I am 
left with  : how to easily read, search, …. these mbox files? 
Eaglefiler does it (Horcrux and Mailsteward don’t, they work by 
directly accessing the IMAP server), but is apparently unable to perform 
incremential backups.

Is there a simple way to do that?

I had a final question regarding the Archive mailbox in Mailmate : how 
does it work (I could not find the info in the Mailmate manual, which is 
unfortunately not searchable; nor did I understand how this mailbox 
became populated by a seemingly random set of emails), is it a local 
storage,  …? Can the exported mbox files, once deleted on the server, 
be re-imported in Mailmate and stored locally (while still searchable)?

I realize some of these questions only demonstrate my poor knowledge of 
how email clients actually work, therefore I would appreciate any help.

Alain
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