Disk utility shows incorrect size

When I open disk utility on my 2011 macbook air it shows that I have used 181gb with 68 free. But when I right click on my Macintosh HD and select Get info it shows that i have 215gb free and I've only used 34gb. *** is going on. My SSD should be 256 minus overhead/recovery. But these numbers are way off. And yes i have tried to reboot and clear my trash can/cache files.

I figured it out. It was the /.Mobilebackup folder that's taking up all the space. turned off localbackup and it wiped out the directory and cleared up the space. But i'm not sure if this is a good idea. It does give my all my space back in disk utility which is the same result as get info from my hd. These commands helped out a lot
df -H
sudo du -cxhd 1 /

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