On sale is one of TerraMaster's newer 4 Bay NAS drives with a lot more premium features over its predecessors.
Featuring 4 SATA Bays with support for up to 20TB each, 2x M.2 2280 NVMe slots for storage/cache, 2x 2.5GbE LAN, Intel Celeron N5095 quad-core CPU, 4GB DDR4 SODIMM RAM (Upgradeable to 32GB), 2x USB 3.2 Gen2 10Gbps ports and HDMI.
A good option for those wanting to have network storage, Plex transcoding, Docker, video surveillance, syncing to OneDrive/Google Drive/Dropbox and more. TerraMaster's own operating system (TOS 5.1) continues to mature with recent features like TRAID which is basically Synology's SHR and new caching support. You can install another OS like TrueNAS or Synology unofficially too.
I own this one myself with the RAM bumped up to 16GB and works well for storing my 4K footage, security camera footage and running a few docker containers.
@Clear just wanted to know which drives are you using for security camera footage? I have 2xIronwolf Pro drives but not sure if I can use that storing it. I'm thinking to get Skyhawk 4TB to configure in a separate pool just for footage. Are you using the footage in same pool as media files?