If you already have an external drive with OS X installed, start up from it. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. You don't need a DVD if you're running OS X 10.7 or later.ī. Start up from the Recovery partition, or from a local Time Machine backup volume ( option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same.
You need an external hard drive to hold the backup data.Ī. There are several ways to back up a Mac that is unable to start. If you don't care about the data that has changed since the last backup, you can skip this step. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. The first step in dealing with a startup failure is to secure the data. Move iTunes, iPhoto and iMovie media folders to an external drive. If you are not sure about any file, don’t touch it.Ĩ. Delete only the files that can be safely deleted. Select Macintosh HD and click “Sweep Selected Drive” at the bottom.īe careful.
This will show the storage size details of the items. Wait until it is finished.ħ.Try OmniDiskSweeper. Highlight the old Backups, press “Delete Backup” and then “OK”. Disk space / Time Machine ?/ Local Snapshots This will delete some caches and will free up some space to take other steps.Ĥ.
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