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Message: <blockquote data-quote="OscarS" data-source="post: 1608644" data-attributes="member: 334220">Hi Nick, My computer is full of files, I use a 1 tr b back up external. I want to back up and then clear my computer of all files, but when I back up again afterwards, will the computer sync with the external and wipe the info which was deleted off the mac also off the external harddrive, or will it just every time add any new info without deleting the old back ups?</blockquote>