The document provides a hardware recommendation for a Process Historian system handling data from 1 PCS 7 OS system with 5000 tags and 1429 average tag values per second. It recommends a server with an Intel Xeon E5-2643v4 CPU, 64GB RAM, 6 HDDs for the system, transaction log, and data partitions, and the use of RAID and regular backups due to the choice of low data reliability. It also recommends a UPS, storing segment and database backups on NAS, and comparable virtualization hardware if virtualizing.