unexpected increase in hard drive usage

I noticed an increase in used hard drive space from 5G to
over 9G overnight...any thoughts on where this additional
usage might be coming from?

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"jg" <anonymous@discussions.microsoft.com> wrote in message
news:39bb01c3fe22$9dc4cf10$a501280a@phx.gbl...
> I noticed an increase in used hard drive space from 5G to
> over 9G overnight...any thoughts on where this additional
> usage might be coming from?