Why the difference in free space on internal drive?

I'm confused - when I look at my Storage info under the "About This Mac" item, my internal drive shows that it has "141.6 GB free out of 499.25 GB" (and why it shows 87.54 GB of Backups, I don't know).
Yet when I look at a Finder window, the drive shows 230.89 GB available. That's an almost 90 GB difference.
I'm assuming (until someone tells me otherwise) that the "About This Mac" information is the 'truest' but I, frankly, don't know.
Could someone please explain this discrepancy to me?
Ever thankful to have smarter heads than I in these forums,
Clinton

Both are correct. You have local snapshots turned on for Time Machine...hence the 90GB's of backups. These backups are deleted as you need space...hence what Finder reports. IMO, there are pros/cons to local snapshots...useful if you accidentally delete something...not so if your drive fails(obviously). Time Machine backups need to be on an external drive, not solely on your internal drive.

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