OneDrive is great for what it does but you may well have many files and folders not synced to OneDrive like Downloads, etc. If you use the same Microsoft account your Settings, Store apps, and OneDrive will come over automatically. Everything else is on you.
You can copy everything to USB drive or the SD card if there's enough space or just what's not on OneDrive. Desktop Apps like Office will have to be reinstalled. Laplink PCMover is nice but it doesn't always work then you still have to do things manually.
use File Explorer look at the directories in C:\ & in your account, copy the ones you need.
look at programs installed and make a list. Verify installation media and downloads are available. If you don't do these things then you might not know what's missing until later which might be too late.