polkadot-node-core-backing is used at run time in 3 crates (of which 3 optionally). It is a direct run-time dependency in 2 crates.

Depender (with downloads and own rev deps) polkadot-node-core-backing version
145K 21 polkadot-sdk optional ^21.0.0
4.7K 5 polkadot-service optional ^21.0.0