Unless you've paid for extended security updates for W10, I'd recommend making the switch soon.
Advice rant for anyone interested
Also, since I saw this confusion in a completely different thread I'll mention this: yes, you can just backup/transfer files with a portable hard drive. That's what I did.
Plus, you only need to mess with reformatting the OS drive, so if you have your data stored on a second internal drive you don't have to do anything to it to continue using.
That being said, having different file formats between drives can cause some odd behavior on rare occasions, so my personal recommendation is to eventually reformat all of your drives to match the default file system format of your distro