Did you mean that you wanted to create a backup for your laptop before updating to Windows 10?
Creating a backup is always a smart decision and is recommended, but it is not necessary before updating to Windows 10 IF you would be upgrading through your reservation and through Windows Update - in this case you won't lose any of your personal files. But if you would be installing from a downloaded .ISO file which would most likely be a clean installation, you definitely should create a backup of all your files first since a clean installation will erase all your personal files from your laptop.
Should you wish to ask further questions, you're welcome to create a Windows Central account and then respond to this thread.