Server Backup software

Calm down, calm down, I don't think many serious Admins use OS X Server these days, it's sadly more of a small office home office (SOHO) product and Apple don't ship rack mount servers anymore nor allow it to run in a virtualised environment on other people's hardware.

I use Carbon Copy Cloner to backup all 8 XServes to a Mac mini running OSX 10.8 client connected to external RAID in another building.

(namely a Drobo which I don't recommend but I'm stuck with it)

Turn on System Preferences>Sharing>Remote Login on the backup server and allow a user for remote login.

Then on the your server, choose CCC to backup to Remote Macintosh and type the domain name or IP address and the /Volumes/path to the folder you want to backup to. (The same folder must also be manually created on the backup server or as CCC won't create it if not there.)

Click Create Authentication Certificate, CCC then creates a Certificate.pkg as shown on the Desktop you need to install on both servers to enable a trust between them.

You can then choose the backup times etc..., you can also set CCC to notify you by email after each back with status.

Neither computer needs to be logged in for backups to take place as it uses SSH to connect and rsync to do the backup.

You can also backup your boot volume to a disk image on the backup server using this method, rather than or aswell as than cloning to a local volume.

An server backup solution that works perfectly with our Mac OS X servers (and laptops) is Zetta. The main reason I choose Zetta was we needed to add offsite backup, and they were the fastest and most affordable of the enterprise-class products I trialed.