I don't use Acronis or Win7 backup so I can't advise. I use Paragon HDD disk manager and clone the HDD rather than image it. If you have a HDD spare and a caddy try 'cloning' it using Acronis. Again no idea how Acronis does this but worth peace of mind if you, at least, have a clone if your images have been corrupted.
OnePlus 5T review: Hands-on