I have been playing with MIX following Mark's comments; it would
address some of the system backup concerns besides being faster.

I see that MIX starts a new mailbox file after 1Mb, so that
a new inbox would tend to have this as a maximum file size.

However, if I migrate an existing 100Mb folder, it becomes
a single 100Mb MIX file. (though new mail appended to it goes in
a new file).

Also, if (in Pine, anyway) a large number of messages are selected from
a mailbox and moved to a new one, the new one is created as a single
large file - even if the old mailbox had many small files. (I tend to
batch up the previous year's worth of messages like this when spring
cleaning).

So even if I wrote a tool to convert existing boxes in chunks, we could
still end up with some large mailboxes. Admittedly, the backup problem is
with inboxes that must be copied in entirety if a single flag is changed
- not so likely with "pre-1995 mail".

I gather that there is a technical reason for this, but it does seem to
detract from the "small file" principle.

-- 
Andrew Daviel, TRIUMF, Canada
Tel. +1 (604) 222-7376  (Pacific Time)
[EMAIL PROTECTED]
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