Is it safe to upgrade a 6 year old ion?

Hi there,

I work at a school and have taught myself the Ion. The school bought the Ion 6 years ago and has not  done a software  update. The software we have is OS VERSION IMAGING PROVISIONING VERSION WE recently hired in some Phillips Moving Lights that are I believe newer lights than our fixture library has. I was wondering if someone could please let me know if they think upgrading all in one go is going to be okay? And which software should I upgrade too? Also is there a way to go back to this version if things go wrong?

Thanks so much in advance and sorry for the n00b question.