A need to update present NAS to handle larger drives

[Enquiries]

I presently have a Netgear ReadyNAS 204 system with 4 Samsung 6 TB drives. It is set up using the NetGear pseudo raid software. I presently have more data to save to the NAS than it has space so I am looking to upgrade to a larger storage capacity. I saw your review of the UGREEN NASYnc DXP4800 Plus NAS and wondering if this would be something that would be worth trying or if you would recommend something else. There was nothing in the review that mentioned any RAID support. It seem like this sort of redundancy is important. The Netgear system seems to power the drives down after a period of time which works well for me since I use it mainly as a backup device and occasionally as a data transfer mechanism,
Thanks for any suggestions.