Back Stitch Diagram - Vertical and Horizontal Method
Back Stitch (Vertical Method):
From bottom to top - Bring the needle up at A, go down over 1 thread and bring the needle down at B. Go up over 2 threads, bring the needle up at C. Go down over 1 thread and bring the needle down at A. Go up 2 threads, bring the needle up at D. Go down 1 thread and bring the needle down at C. Continue in this manner until the end of the row.
From top to bottom - Bring the needle up at G, go up 1 thread and bring the needle down at H. Go down 2 threads, bring the needle up at F. Go up 1 thread and bring the needle down at G. Go down 2 threads and bring the needle up at E. Go up 1 thread and bring the needle down at F. Continue in this manner until the end of the row.

Back Stitch (Horizontal Method):
From right to left - Bring the needle up at I, move over 1 thread and bring the needle down at J. Moving left, move over 2 threads and bring the needle up at K. Move over 1 thread (to the right) and bring the needle down at I. Move left over 2 threads and bring the needle up at L. Move to the right over 1 thread and bring the needle down at K. Continue in this manner until the end of the row.
From left to right - Bring the needle up at N, move to the left over 1 thread and bring the needle down at O. Move to the right over 2 threads and bring the needle up at M. Move to the left over 1 thread and bring the needle down at N. Move to the right over 2 threads and bring the needle up at L. Move to the left over 1 thread and bring the needle down at M. Continue in this manner until the end of the row.