[Mailman-Users] Questions About 2.1.9 to 2.1.11 Upgrade

When I upgraded my test Ubuntu system from Mailman 2.1.9 to 2.1.11 I saw messages for each list:

 Updating mailing list: mailman 
 Updating the held requests database.
 - updating old private mbox file
 looks like you have a really recent CVS installation...
 you're either one brave soul, or you already ran me
 - updating old public mbox file
 looks like you have a really recent CVS installation...
 you're either one brave soul, or you already ran me
 Fixing language templates: mailman 

What is updated in the "private mbox file" and the "public mbox file"? I need to know if I need to backup the

 /var/lib/mailman/archives

directory before I convert. I would prefer not to, as the archives are VERY large.

I assume that if something drastic goes wrong with the update, then the only recourse is to restore all of the Mailman directories from a tar backup taken just before the conversion. I assume that just re-installing the Mailman 2.1.9 package (that I am currently running) over the 2.1.11 package will not work. Note that these packages are ones I built from the SourceForge source, not the Ubuntu/Debian packages. Thanks.

Barry S. Finkel Computing and Information Systems Division Argonne National Laboratory Phone: +1 (630) 252-7277 9700 South Cass Avenue Facsimile:+1 (630) 252-4601 Building 222, Room D209 Internet: BSFinkel@anl.gov Argonne, IL 60439-4828 IBMMAIL: I1004994