Best Upgrade Options ReadyNAS 204

Hello All,

I've been using my ReadyNAS 204 for about a decade. The 204 has been a trusty media/file server for all these years. But, it's time to look at upgrading. I currently have about 3.5tb of the 5.5ish tb worth of space filled with data I would like to keep. However, I'm not sure if anyone here has gone down a similar path of upgrading their chassy while keeping their data/raid intact.

Also, does anyone have their favorite models that they would recommend for transcoding/streaming HD content?

Any suggestions, help, or lessons learned from the community would be greatly appreciated!

Respectfully,