never liked that knot myself, never really binds that tightly to the spool so when you're spooling the backing on under *tension it just keeps spinning around the spool. I always use the grinner knot, pass the backing around the spool twice then tie a 4 or 5 turn grinner knot.
GRINNER KNOT
Bites really hard to the spool so it stops the line spinning around.
*Always wind the backing on under tension otherwise when you're playing a good fish the tension put on the line can cause the backing on the upper layer to dig into the looser packed coils underneath potentially causing it to stick or jam there, losing you a big fish in the process.