How does this affect people who bought the lifetime service back in 2010?

I’ve been running a plex server on an old desktop bought in 2016. Mostly streaming movies and tv shows to my family. I have a 2 TB SSD and a spare 2TB HDD. I was thinking about getting a mini PC to swap out the larger desktop. Could I get a larg HDD and ad it in an enclosure to the Mini PC to handle the media volume?