Raab and many others use backstop and the solution to the backstop interchangeably.
He says "there will be a backstop of some sort be it technology or..."

I, a layman, offer this explainer.

Experts please put me right if it is wrong or misleading. 1/9 The backstop is a condition in the WA that ensures legitimate conduct of trade across the IRL/NI border without physical border infrastructure.
Currently conformance is met because both sides of the border use and meet the same standards by being in the CU and SM. 2/9