Why does my mac have 100 gb of "back up" and 90 gb of "other" memory used up when I have hardly anything on it. Is there any way to identify what those things are that is consuming so much memory?

10-11  Source: Network gathering  Views:2 

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I have 25 gb of music. 20 gb of movies. 5 gb of pictures. 10 gb of apps. 102 gb of "back up. and 85 gb of "other. which leaves less than 70 gb open on my harddrive.. Why? What is that almost 200 gb of memory? How Do i pinpoint it? I use time machine and an external harddrive to back up my files so what is that? any answers or ideas?
architecture12 wrote:
I have 25 gb of music. 20 gb of movies. 5 gb of pictures. 10 gb of apps. 102 gb of "back up. and 85 gb of "other. which leaves less than 70 gb open on my harddrive.. Why? What is that almost 200 gb of memory? How Do i pinpoint it? I use time machine and an external harddrive to back up my files so what is that? any answers or ideas?
Do not worry about the backups.  They will be deleted automatically after a week, or if your HD gets too full.  See #30 in Time Machine - Frequently Asked Questions.
The "other" stuff is just that -- all sorts of things that don't fall into the few categories listed.  The operating system, system work files, plus lots of your stuff like documents, mail, etc.  See Lion's Storage Display
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