YouTRACK "IntelliJ IDEA: Backlog (IDEABKL)" vs "IntelliJ IDEA (IDEA)"

I have a quick question regarding the IDEA issue tracker: What's the difference between "IntelliJ IDEA (IDEA)" and "IntelliJ IDEA: Backlog (IDEABKL)"?

That's vs

I think this question was asked back in 2007, but received no answer then either (

I'd really appreciate some official clarification from the IntelliJ team.

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