Hello, please go to: Control Panel > System and Security > Backup and Restore (Windows 7), and click on "Create a system image" on the left. You can choose to save it to your USB flash drive. If you plan to perform a system recovery in the future, please prepare another empty USB flash drive and go to https://www.microsoft.com/software-download/windows11 to download the MediaCreationTool. Run it, select "Create installation media for another PC," insert your USB flash drive, and follow the instructions (please note that this will erase the data on the USB flash drive).
Once created, if your system fails in the future, insert both USB flash drives into your computer, and press F7 or F11 during startup to enter the boot menu (the method for entering the boot menu may vary depending on your computer; please refer to your device's manual to confirm the correct method). In the boot menu, select your USB flash drive to enter the system installation interface.
Then, in the installation interface, select "Repair your computer" and choose "System Image Recovery," and locate the system image you previously saved.