Back-up Devices

Reference the following sites for tape backup drives
1)Worldspan: Backup Systems
www.span.com/products/b.htm
2)APS Tech
www.apstech.com
3)Seagate Technology Inc.
www.seagate.com
4)Iomega
www.iomega.com
5)SCSI Tape Backup
www.oznet.net/techna/scsi/scsi.htm
5)SCSI Reference
www.ecrix.com/support/reference-SCSI.cfm

I am not sure about Fiber but SCSI Tape Drive do come as External (I am using one myself - HP External DAT8). I suggest if you have space on your server put one internal DAT8 Drive else for external use the external SCSI port (behind the Server) & connect one external SCSI Dat Drive there.
Akash

First of all, you ought see the data volume that you want to backup . And the time that's could take . After take a look on the drivers delivered with your software .
In last hand, the price of the supports (tape, stream ...) and of the drive.