My available disk space does not make sense. Why? I have a 256 GB SSD installed in my Macbook Pro. Today I observed that Finder tells me that I have a free disk space of 247.51 GB, which is unquestionably wrong.

At the same time, in System &rarr; About this Mac, I can see I have 44.73 GB of available disk space. I think this number is more accurate, but it tells me that 202.78 GB of used space is backup, which is not right. I do not know the actual size of backup files, but my personal files take about 125 GB, so there cannot be 200+ GB of backup files.

I'm confused. What's happening to my computer?

Edit: This is the related snapshot, the size given by Mavericks are slightly different then yesterday, but it's still not making sense. I believe DaisyDisk's report is right.

The 256 GB SSD is the only hard drive that I have installed. I replaced the original HDD with it.



Edit 2:
Today the available disk space gone crazy. It shows that I have 265.06 GB available...
you are on a laptop using time machine. time machine uses local snapshots on portable computers. they are stored at /.MobileBackups if you want to have a look and verify how much space it is consuming.