Time Machine Local Snapshots

So, I decided to install Windows 8.1 on my MacBook using Boot Camp.

First off, I had to make some cleanup on my hard drive, so I went to Finder and ditched movies and other junk to external HDD. In half an hour my internal storage looked very promising (I am going to use only Visual Studio under Windows, so 100+ Gb is more than enough):

I went to Bootcamp Assistant tool, and… it showed me that I have just 41 Gb left! What the heck?!..

Disk utility showed same figures as Bootcamp.

"About this Mac" storage view finally showed me where my space is (not my picture, but looked similar):

It turned out that those backups are local snapshots made by Time Machine. I do my backups regularly to an external drive, but turns out that Time Machine also silently saves local snapshots as long as there’s enough space for that, provided that the slider in its Preferences is in the On position:

I figured that I shouldn’t trust sliders and used the terminal:

$ sudo tmutil disablelocal

It turns out that the command does not only disables local snapshots but also conveniently removes all local snapshots.