jrbaconcheese

There are expansions for Synology: https://www.synology.com/en-us/products/accessories?tab=nas&category=expansion_units

Probably most important is the 5-drive DX517 that will definitely work with your 1821+ https://www.synology.com/en-us/products/DX517#specs

Unraid as I understand it will do that

As someone who is not a former sysadmin and only vaguely familiar with *nix, I’ve been able to turn my home NAS (bought strictly to hold photos and videos backed up from our phones) into a home media sever by installing Docker, learning how the yml files work, how containers network, etc, and it’s been awesome.