Updating/Rebuild from 9.2.1.8

[Dano]

I did a build back in 2014 and haven't really done anything with it since. Been running great but no real attention paid to FreeNAS since then, so sort of a Noobie question...I have been running a 9.2.1.8 FreeNAS system since 2014 on a system that is composed of the items below. I think I remember that the AMD processor is the weak link that has prevented me from upgrading past 9.2. I am looking to figure out if I should do a total rebuild or if I can repurpose parts and what exactly will I need to do in order to keep the data (Family pictures, movies...) on the drives.

Thanks for any advice

Dan
RosewellMicro ATX Case and power supply
2 WD Red HD's
ASUS Motherboard
Some ECC RAM
and an AMD Processor