High Bandwidth Backup?

I'm a little new to this whole Network Administrator role and I know this is mainly for web based discussions, but it seems that questions get answered even more generally...So I have the following.
How are people backing up terabytes of data without bogging down their CPU with a backup program or their network with the data?
We have Veritas 10 and were going to place Veritas 10 on one server (backup) and then hook up the tape drive to the server holding terabytes of data (bigserver). That way the processing of the backup would be handled not by bigserver, but on the other hand the data could be sent directly from bigserver to the tape driver without utilizing lots of network bandwidth.
David.

With, the data is over a terabyte now and will only continue to increase. If the machine isn't dedicated to the backup process, I have my doubts we'd ever complete a backup for the machine. Its a web server so there is very little opportunity to use CPU which is not being consumed by visitors.
David.

micheal is right.. u should be running a cluster of mirrored servers.. similar data isdistributed across servral server.. eases down the hardwork..and provides redundancy...btw.. i dont think you can be serving terabytes of data on a single web server.. which is very  busy by visitors too.. it will crash in no time..unless it has 32 Opteron CPU's and  34Gig of ram..

Well, we ended up creating a dedicate subnet for backup. Now the information will be transferred over a gigabit network, but a separate one from the internal network, allowing functioning to continue at full-speed (there is a lot of internal communication) but also allowing backups.
David.