When creating a Windows recovery drive, you may see an option to back up system files. Selecting it makes the USB more useful for recovery, but it also needs more time and storage space.
System files on a recovery drive help Windows provide more repair and reset options. They do not include all personal files, installed programs, or a full copy of your disk.

Select it when you want a stronger repair USB for the same computer. Skip it only when the USB is too small or you need a quick repair drive. Either way, it should not replace a real system image.
Step 1. Open Qiling Backup and choose System Backup.

Step 2. Confirm that the Windows system and boot partitions are selected.
Step 3. Save the image to another drive and click Proceed. Keep this backup separate from the recovery USB.
Choose the system files option if your USB drive is large enough. For real rollback, keep a separate system image backup.