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http://www.imore.com/no-apple-music-not-deleting-tracks-your-hard-drive-unless-you-tell-it

>On Wednesday, I saw a post widely shared about an unfortunate individual who lost half of their local library and was blaming Apple Music for automatically deleting their local files.

>I sympathize, and I'm very glad this person had a backup of their music, but I want to dispel some FUD here: Apple Music has definite problems and its matching algorithms aren't great, but this is simply not how the service works. Apple Music should never automatically delete files off your primary Mac's hard drive unless you specifically delete them first.

>If you have tracks that aren't in Apple Music's library — say, personal recordings, for instance — they will be uploaded as-is to your iCloud Music Library, though songs encoded in ALAC, WAV, or AIFF will be uploaded as AAC 256kbps files for easier storage.

>Once this matching and uploading process is complete, you have two libraries: your locally-stored library on your original Mac with all your old files, and an iCloud-stored library that you can access from other devices.

>On your original Mac, Apple Music will never delete songs without your knowledge. Your original library is scanned into iCloud, but your songs are yours, and Apple will not automatically delete them, or replace them with its own proprietary copies.