Which 4 bay nas?

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For your requirements, considering the need for video recording, backup server functionality, and the possibility of running containers or lightweight VMs, both the Synology DS923+ and DS423+ would be suitable options to explore. The DS923+ offers enhanced performance and features, making it a robust choice for multitasking and virtualization tasks. However, if you're looking for a more budget-friendly option without compromising too much on performance, the DS423+ would be a solid alternative. Both NAS models support 4-bays, providing ample storage capacity for your needs. Additionally, since you already have 4 x 8TB drives and 2 x 1TB M.2 drives ready for installation, either of these NAS units would complement your existing hardware well. Considering your budget and requirements, the DS923+ or DS423+ would be reliable choices to consider for your prosumer or small business setup in Denmark.

https://nascompares.com/nas-builder/