Sure, it's simple. Buy an NAS box or get an Adaptec 8805 (with two 4 SATA fan cables) and 8 big (like 12-14TB depending on the best deal at the time) WD/HGST HDDs in RAID 6. But you need a full tower case. Not cheap but plenty of storage.
edit: I used 14TB SAS drives (at $254 ea) for a similar build recently but then you need two different fan cables (SAS instead of SATA), bought the the Adaptec on EBay new out of Hong Kong.