Simple past tense and past participle of backlog.(verb)
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Use "backlogged" in a sentence
"American Airlines said Wednesday it already had rescheduled all its backlogged passengers."
"School maintenance and repairs were permitted under the 2009 stimulus law, but the need is greater today: $271 billion in backlogged maintenance and repairs, according to a study by the 21st Century School Fund."
"Nearly 80 percent of U.S. government agencies are at risk of illegally destroying public records and the National Archives is backlogged with hefty volumes of records needing preservation care, the audit by the Government Accountability Office found."