I recently purchased a late 2014 MacBook Air to complement my Mac mini. The mini is my ‘main’ machine, housing my complete music library. iTunes Match and Home Sharing are enabled on it and the MacBook. Why is iTunes taking up 10GB of storage on my MacBook? As I’m sharing my library from the mini to the MacBook, shouldn’t this not be the case? Is there anything I can do to clear this 10GB? Arthur Dardalis Christian Hall says: It sounds like the space may be taken up by device backups, which won’t have moved with your media library. iTunes backs up certain iOS data such as app files, settings and photos each time you sync an iOS device (if that device is set to back up locally, rather than to iCloud). These backups are in /Users/<your_username>/Library/ Application Support/MobileSync/Backup/.
Open a Finder window, click Go on the menu bar and then hold å so that the Library item appears in the list. Choose it and then dig deeper from that point in the path listed above to reach the Backup folder. Select that and choose File > Get Info to see how much space the backups use. Individual backups can be deleted from the folder, or under Devices in iTunes’ preferences.