Configure redundant NAS boxes

I run a network of about 20 machines that all are located at the same site. I am using Microsoft Server 2003 Small Business Edition for Active Directroy and Exchange, but nearly all of my file serving is handled by a NAS box. I am using a NETGEAR ReadyNAS NV box.

I am backing up the data stored on the NAS box to external hard drives daily. However, I would like to have a backup NAS box that is immediately ready to go in the event of a failure on my primary NAS. I've purchased a second ReadyNAS NV and I need some help on the best way to configure this.

My first instinct would be to put the backup NAS on the network and run nightly backup routines to sync the primary and backup NAS boxes. This sounds fine to me, but I'm wondering if there is a better solution. Does anyone know if there's a way to configure these NAS boxes so that they replicate automatically?

To summarize, I need
1) A backup NAS that is ready to go with almost zero downtime in the event of a failure on my primary NAS.
2) The backup must be synced with the primary at least daily.
3) A small impact on performance on the primary NAS.
4) The backup must be invisible to users until such time that it is activated as the primary.

Thanks for any help.
qadminAsked:
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DCMBSConnect With a Mentor Commented:
Hi,

Have a look at rsync.  This is a linux utility for replicating data and it can be used in windows as well. we use it in very similar scenarios to that described. The rsync utility is very efficient at synchronising folders as it just does a delta copy of changed portions of files which reduces the amount of traffic.

The windows version is called DeltaCopy and can be downloaded here
http://www.shareup.com/DeltaCopy-download-45122.html

As this a very efficient utility you can schedule it to run hourly and your backup will almost be real time.
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qadminAuthor Commented:
I should clarify that I am asking for a way to replicate automatically in real-time or near real-time. I'm already comfortable with setting up automatic scripts to backup nightly.
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