How should I restore my Library folder from backup archive?
I like to make an admin user - new short name and then restore the files from CrashPlan to /Users before I create the Mac log in account. That way, you fix any permissions and user ID conflicts.

When you make a new account with a specific short name and the folder with that short name exists - macOS will then ask you if you want to reuse that folder and it proceeds to use / fix / upgrade any settings you have restored and then makes the new user active.

The harm in leaving the new folder in the wrong place is you don't get the files and settings used and your system will make up new settings and files in the proper location as you launch each app.

Code42 support for CrashPlan is also very good if you get stuck with restoring things and you want some individual help or have back and forth type questions that don't work well here.