Hello. T110 -II supports up to 6 hard drives. It would not hurt to set up those drives in RAID 1 or RAID 5 (for more than 2 drives) configuration just in case of failure before the archive is backed up. If your archive is not that important, you can set the drives in RAID 0.
We have a PowerEdge T110-11 server with two 600 GB 15K SCSI drives in a RAID 1 configuration via a PERC H200 controller.  This server is used in a production environment.  We want to add an additional internal disk drive to the server, but that drive (or drives) will only be used for archival purposes.  Archiving will only be done periodically, at defined intervals.  The production side needs the speed and redundancy of the SCSI/RAID configuration.  The archival disk will not.  I am not sure what the PERC H200 supports beyond the two SCSI drives we have.  How  would you recommend we do this?  Should we purchase two SATA drives and use them in a RAID 1 configuration like we have for the SCSI drives?  All drives are backed up to a Dell RD1000 disk cartridge system, by the way.  I'm not sure if we need RAID for this archive disk, since it will be backed up regularly.  Others here are pushing for using an external USB drive for archiving, due to the very low cost. Thanks for any suggestions you can offer.
PowerEdge T110 II/PERC H200 Drive Expansion Question