Multiple EX4100 in RAID

I’m looking to add a second EX4100 to my system, but am looking to achieve redundancy across the devices as opposed to adding storage capacity, and was wondering if there is a way to have the 2 devices run in RAID with each other, or to clone all data between them automatically.

You can setup the remote backup on the device to backup or synchronise the data between EX4100 device. You can refer the link to know the steps for the remote backup between My Cloud devices.

You can setup the same RAID on both the EX4100 devices and setup the remote backup to keep the same data on both My Cloud EX4100 devices.