Back stitched herringbone stitch is a combination stitch (Back stitch and herringbone stitch). This makes pretty borders and gives additional strength and color to regular herringbone stitch.
Stitch herringbone stitch like usual.
Repeat the above two steps.
Herringbone is ready.
As shown below bring needle up near the cross formed by the herringbone stitch and tie it down to the fabric using a back stitch.
Repeat for all the crosses.