Is the DS225+ worth it over the DS224+?

The DS225+ brings a newer Intel platform and faster networking, so it is the better pick for containers, virtualization and busier file sharing. The DS224+ remains capable for plain backup and storage if you find it cheaper.

Does it come with hard drives?

No. It is sold diskless, so you buy and install your own 3.5-inch or 2.5-inch SATA drives. Plan for two drives if you want RAID 1 mirroring.

Can it run Plex and Docker?

Yes. DSM supports Docker containers and Plex through its package center, and the Intel CPU handles hardware transcoding for many formats. Very heavy 4K transcoding can still strain it.

How much RAM can it take?

It ships with a small amount of DDR4 memory and has a SO-DIMM slot for expansion. Check Synology's compatibility list before buying a module.

Is it good for a small business?

Yes. It handles file sharing, scheduled backups, snapshots and remote access for a small team. For more than a handful of heavy users, a four-bay model gives more room to grow.