Transferring from ZCS (Dual Quad-Core Xeon 2.2GHz, 7GB RAM, RAID1 SAS) to a NFS network server, it takes about an hour to backup 9.6GB (149 mailboxes) of these compressed archives.
This Zimbra setup is in a school, and the 149 mailboxes are just for staff - I don't bother with individual ones for students. I still do a full /opt/zimbra tarball every week though.
The main factors governing your backup speed will obviously be mailbox size, number of mailboxes, and your backup infrastrucutre/media.
I've put my script on my wiki page (
Webman-Notes - Zimbra :: Wiki) for you to have a look at and use as you wish. On review, it actually backs up to the local disk first and then moves the file to NFS - feel free to experiment exporting directly to NFS though if you want
