PE 2850 and SCSI external tape

[Andrea Visinoni]

hi there,
i've just bought an HP storageworks DAT72 external SCSI tape drive and i 
wish to connect it to my DELL Poweredge 2850, i've 2 questions about that:

1) My server got a PERC 4e/DC for SCSI RAID disks (docs says that i 
cannot connect here my tape), and an onboard LSI controller not used.
Can i connect my tape to one of the internal SCSI connector on the 
backplane riser?
Can something like this product allow me to do the trick?
http://store.thescsistore.com/scsiulinhdb61.html
My dell consulent said me i have to get ANOTHER controller just for the 
tape, i don't want to pay hundred dollars for a 90 dollars refurbished 
tape drive.

2) I got debian stable on this server, which is the best straightforward 
way to backup a bunch of directories? tar? or there is a best tool for 
this job?
Do i only need "st" module in the kernel?

Best regards
Andrea