I am presently considering to install zimbra network edition on Ubuntu 8.04 under ESX as an in-house mail server. This would be a scenario for about 60 users, who presently have a total of around 30 GB of messages (uncompressed) on our old server (growth rate of about 2 GB/month). Most users will generally log in through Thunderbird imap client (not the web interface). They expect to have a safe backup of their mails, which means the mails should also be backed up to tape.
Any advice for configuring the server? In particular:
A) I presently feel that we should use the backup mechanism of Zimbra network edition (full weekly, incremental daily), but direct its output to a network drive. That drive could then be backed up to tape once a week. Does this sound reasonable?
B) Where should we store the mail files (not backups)? On the same virtual disk as the OS is running on, or should we store them also on an external drive? Any advice?
C) What would be a good scenario for backing up the system and software? We could obviously keep a copy of the VMWare image (even though that would be big if the user's mail files also reside in that image, see question B). Any other ideas?
Any other advice for this type of set-up?
Thanks in advance