backing up - RAID or tape drive?

[pd3 luukku com]

Hello All

I appreciate that this is not quite the place to ask
this question but if some of you out there would be
willing to spend some time answering this question I
would be very grateful.

In a place where I do voluntary work we have got some
money to buy a pc to act as a server.

We want to back up our data.

Someone has suggested using software RAID but I thought
that a tape drive of some sort would be more appropriate
for backing up.

What do you guys N gals think.

t.ir