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for a backup server you need an offsite backup really, Or at least another box on that network but if you have 1 server then software/Hardware raid 1 or so will do.
To answer the OP question: when I only have two disks, I sometimes go for this solution: a software Raid1 (mirrored) "live" partition that uses half the capacity of first and second disk, and a "backup" non-mirrored partition on the remaining free space on each disks. The backup script does alternate the target between the backup partition on the first and the second disk. If one disk will broke, the server could resume working from the second disk. If some software error or misconfiguration erases the live data, I have two local backup sets. The data is also copied to a network target on another server, once a day.
On some of my LEBs I see the "central backup" button on SolusVM, but I don't trust this feature. Reputable hosts can offer you a true backup solution at additional price, you simply need to ask for this.
That was intresting to read all this however, based on pcan view, what about making it disk Raid 0 and add one more disk to take snapshop or may be add it in array. That way I will have 2 copies of data as well as better performance and cheap too?