Q: Storage

1. Start up in Safe Mode.

    http://support.apple.com/kb/PH11212

2. Empty Trash.

   http://support.apple.com/kb/PH13806

3. Disk space / Time Machine ?/ Local Snapshots

  Local backups

   http://support.apple.com/kb/ht4878

4. Delete old iOS Devices Backup.

    iTunes > Preferences > Devices

    Highlight the old Backups , press “Delete Backup” and then “OK”.

    http://support.apple.com/kb/HT4946?viewlocale=en_US&locale=en_US

5. Re-index Macintosh HD.

    This will take a while. Wait until it is finished.

   System Preferences > Spotlight > Privacy

   http://support.apple.com/kb/ht2409

6.Try OmniDiskSweeper. This will give the storage size details of the items.

       https://www.omnigroup.com/more

   Select Macintosh HD and click  “Sweep Selected Drive” at the bottom.

   Delete the files yo don’t want to keep.

   Be careful. Delete only the files that can be safely be deleted.

7. About “Other”:

   http://support.apple.com/en-us/HT202867

8. Move iTunes, iPhoto and iMovie media folders to an external drive.

   iTunes

   http://support.apple.com/en-us/HT201562

   iPhoto

   http://support.apple.com/kb/PH2506

   iMovie

   http://support.apple.com/kb/ph2289