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Use "backends" in a sentence
"The standard CUPS communication types of IPP, LPD, HP Jetdirect are modules called backends in the CUPS system - the rest of the driver parts are called "filters.""
"I'd still like to write an Amazon S3 backend, and backends for other suitable protocols like HTTP GET/PUT and Venti, of course."
"If none the backends referenced by the cache have it, or the cache knew nothing about that block, then the proxy would try all backends to try and find the block, before giving up and reporting failure."