Best practices for backup

Hello all,

We want to implement ZeXtras solutions on our client's Zimbra servers (and our server of course ). We want to send data on another server (on the same network) I would have tips about a good backup with ZxBackup :

1. Perform an External Backup (complete backup isn't it?) each week on local machine then rsync it to another server (for security & administrative reasons)
2. rsync the /opt/zimbra/backup/zextras/ each hour (or less) to another server

We heard that NFS wasn't a good option to directly save data on another server, is that true ? :confused:

If the main server crashes, is it possible to rsync the saved /opt/zimbra/backup/zextras/ on a fresh install and have all my data ? If I rsync data from Real Time Scanner (where are they located ?) more often, is it possible to reduce the loss of data ?

Many thanks in advance for you lights !