Yes, that would work. Be aware that discs can deteriorate and become unusable so HDD is the safer option. If you have a lot of these files and they are all full backups, you could delete all but the latest 2 or 3.
What is ransomware and how do I protect my PC from WannaCry?
Disney layout supervisor Rob Dressel on the challenges of visualising Moana
Siri vs Google Assistant