Very easy. Just copy them to the new drives. Open BIAB and tell it where to find the new folders' locations. Note that the actual Folder names are RealTracks and Drums—there is no folder called RealDrums (some of us have been suggesting this be fixed for years).

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BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5