Backup Strategy

Not sure if this is the right place to post this but...

I wonder if someone could suggest a backup solution to backup 5 office
servers. I would prefer to utilise a single backup device rather than
seperate backup devices per server (less man hours and cartridges needed).
I'm looking at a capacity around 600GB, could anyone suggest a suitable
product as I'm not too familiar with different backup devices.

The server will be Dell PowerEdge 1U servers and to keep the initial costs
down, they do not include tape drives.

Thanks in advance
Neil