When creating a Windows recovery drive, the Back up system files option can make the USB more useful for reinstalling Windows. It also requires more space and time.

Including system files helps the recovery USB offer a Windows reinstall path. It does not include your documents, photos, installed desktop apps, or a complete copy of the system disk. A separate file or system image backup is still necessary.
Use a larger USB drive. Deselecting system files can produce a smaller recovery tool drive, but it may not offer the same reinstall capability. Do not confuse a Windows recovery USB with a backup image.
Use an external drive or a second location for documents and, if desired, a system image. Store the recovery USB separately so it is available when the internal drive fails.
A Qiling System Backup creates a separate image of Windows and its required partitions on another drive. It complements, rather than replaces, a recovery USB.
Step 1. Connect an external disk with enough space and open Backup and Recovery > System backup.

Step 2. Review the automatically selected Windows, boot, and recovery partitions. Confirm this is the system you want to protect.

Step 3. Choose the backup destination on a different physical drive or network location. Check the available space and task name.

Step 4. Click Proceed, wait for the backup progress to finish, and verify the image is listed at the destination. Keep recovery media separately.

Does the recovery USB contain my files? No. Back up personal data separately.
Can I reuse a USB with important files? No. Copy its files elsewhere first; the recovery-drive wizard erases it.
Include system files if you want more reinstall options on the recovery USB, and store personal data in a separate backup.