Before I got a purpose bought desktop for BI, I repurposed an old file server I had laying around. It had 16x 3tb drives. I was quite pleased with Drivepool. I combined them all into one big drive, It doesn't have parity drives but the files can be duplicated. I set duplication at 3. It cut my storage size by 3 but I could live with that. I still had plenty of storage and had redundancy. All drives were formatted in NTFS so they could always be plugged into another computer if needed. It was $30 well spent.