AW Extract
Let me sell it to you this way.... if your AW16G's hard drive ever dies (and it will at some stage) ALL your music that you've backed up religiously on CDs is completely and irrevocably lost unless you can get a new drive into your machine - it may not be possible to replace a drive that old with something new - they may no longer exist or be purchasable.
Or if your machine otherwise dies (someone drops it, the fader motors die, the power supply goes etc.) and is not repairable, then all your music suffers the same fate unless you buy another similar machine - and again, that may not be possible, or convenient.
Why? Because those CDs are in a Yamaha proprietary format that nothing else will read.* Try putting one in your PC and see what it makes of it.
AW Extract is a very simple (and clunky) program that allows your (PC) computer to read those disks and extract the WAV files which are on them, meaning you can then use them in some other way, such as a DAW program. I finally moved on from my AW4416 about a year ago and I'm resurrecting older tunes and remixing and altering them in
Reaper from the back up disks created in the AW4416.
It's a very small program and doesn't actually install on your PC, you just run it from the file. So download it and keep it somewhere just in case, is my advice. Just in case.
You know that very smart people say that data doesn't exist unless it exists in THREE places. Your data only exists in two. I used to burn two lots of CDs to solve that but that still leaves you at risk of machine failure. Archiving your backups via AW Extract is another way to get that third copy.
* I don't know this for a fact with the AW16G, perhaps they got a bit smarter with its data storage. Nor do I know that the AW16G format is the same as the AW4416, or that AW Extract will work with AW16G backup disks, but you'll be able to work it out easily enough.