Disk used suddenly jumps by nearly 100% unexpectedly

Good afternoon
I have run into something which is of concern to me. My organisation has been using DPM without issue to backup various things like system state on DC's, Exchange DAGs. I run weekly reports on the disk utilisation. It has been growing steadily by circa 0.4%
a week. Suddenly the reports showed a huge increase in usage, 91.46%.
This of course came as a huge surprise and I have no idea why it occurred. What I am after is some help in diagnosing the cause of this or if anyone has seen anything similar before? I am wondering how I can track this down to the exact date and time the
jump occurred?
Attached is a screenshot of a disk utilisation report. I can think of no reason why the disk utilisation should have doubled.

I was finally able to identify that the unexplained increases in disk utilisation were caused by expired recovery points not being deleted as expected.
Running the script pruneshadowcopies.ps1 would not run properly and would crash (this script is supposed to run automatically nightly to remove old expired recovery points, so presumably because it was crashing when I ran it manually it would display the
same behaviour when it was run automatically by DPM). I managed to resolve the problems by deleting one of the protection groups and then re-ran the script which this time did not crash and removed expired recovery points as expected. I don't really know why
this worked however.

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From: Jose Ramón Tourón 14-Sep-07 08:34
Subject: Database Time Spent Waiting (%) at 100 in event class Commit
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Error Number (if applicable):
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From: Oracle, Helmut Pfau 14-Sep-07 12:52
Subject: Re : Database Time Spent Waiting (%) at 100 in event class Commit
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Commit
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Subject: Re : Database Time Spent Waiting (%) at 100 in event class Commit
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tt2

Disk used suddenly jumps by nearly 100% unexpectedly

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