Can't Backup my 500GB = 500GB

OK... I've got an internal 500GB drive that's got ~400GB data on it... I have excluded everything on my system but it (so that TM says it wants to copy 401.6 GB data) won't let me use a 500GB drive (formatted 465.8 GB) because it thinks it needs 481 GB space...
What's going on?

Remember, too, that hard drive specs are in 10^9 bytes (500 GB = 500,000,000,000 bytes), whereas Mac OS X reports the space in 1024x1024x1024 bytes (500 GB = 536,870,912,000 bytes), so a 500 GB hard disk is actually only about 465 GB in size according to Mac OS X.
Edit: I see now that you're complaining about the apparent loss of size but that TM is reporting one number that needs to be backed up and another for the required space. It's entirely possible that whatever indexing TM needs will take up a big chunk of space.
Message was edited by: Alan Somers

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Hello Apple Support Communities! This is my first post. Hope this finds you all well My first year as an Apple user. I bought a 2-Tb TC and am running my first backup to my MacBook as I write this.
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P/S: Apologee if this has already been discussed before, thus, a link to previous discussion thread would highly be appreciated)
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Thanks. Steve

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Can't backup to computer

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Can I backup and restore files if I used a hard drive?
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RealDave

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I have my IPhoto library on an external hard drive and want to include this in my time machine backups.

Welcome to Apple Support Communities
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Can't Backup my 500GB = 500GB

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