Need suggestions - best way to backup computers across LAN

I want to have centralized unattended backup of 5 computers on my LAN but have no idea how to implement it. One of the computers will have a USB 3.0 to SATA Dual Bay External Hard Drive Docking Station with two 2TB SSD's in it that will be online 24x7 that is on a UPS.

I'd appreciate any ideas.