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
2.8K 5 polkadot-service optional ^18.0.0
700 5 polkadot-sdk optional ^18.0.0