1. did you back up to onedrive in the cloud or on your computer? If your go to onedrive.live.com, and you login, everything it backed up should be there. If your only
backup was the laptop that is now not working, you may have a problem. Have you tried a REFRESH of your computer? (you can try and clean your computer but it won't delete your files like a RESET will) or is it hardware that has made it unusable?
2. The other option for you to recover things is if you UPLOADED any of your tray files to the gallery, buttttttttt it sounds like you didn't.
3. In the future, you can use onedrive, google drive or dropbox (I use all three because I am insane about backing stuff up) and, as long as you have an internet connection, you will have backups, but there are size liimitations unless you are a business user (of dropbox - I have a terabyte.)