At a guess this has been used by system restore and will increase over time until it reaches 15% of the disk capacity. You can get this space back by turning off system restore, but do so at your own risk!!!!
Alienware 17 R4 2017 review
These brilliant Lego posters show just what children's imaginations are capable of
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Comment réinitialiser votre PC, ordinateur portable ou tablette Windows ?