Shadowcopy storage on 100% when rebooting during backup

Dear ladies and gentlemen,
over a longer period of time we had the shadowcopy storage set to 100% on some machines, not knowing what was causing this.
Now we found out, Acronis 11.7 does this by design: Somewhere about the creation of the VSS snapshot, the shadowcopy storage is set to 100% and reduced to 5% (Windows default) afterwards.
When rebooting the machine during an active backup task, shadowcopy storage is not reset to 5% (but sits at 100%).
Workaround
The idea is to set the shadowcopy storage to 5% before every task.
Windows' VSS providers are able to be configured by vssadmin. The following sets the value to 5%
vssadmin resize shadowstorage /for=C: /on=C: /maxsize=5%
The command is working when typed into cmd and from batch file, but not when launched from Pre-backup command.
Errorlog from AB 11.7
Fehlercode: 1024
Module: 0
Zeileninfo: 858cc05f488a8dcc
Felder: ExitCode : 2, $module : mms_vs_50088
Nachricht: Child-Prozess endete mit dem Code '2'.
--------------------
Fehlercode: 3
Module: 167
Zeileninfo: 6bf76712d83410c4
Felder: $module : mms_vs_50088
Nachricht: Ausführen des Befehls 'vssadmin 1.1 - Verwaltungsbefehlszeilenprogramm des Volumeschattenkopie-Dienstes
(C) Copyright 2001-2005 Microsoft Corp.
Error: Unerwarteter Fehler bei einer Komponente des Volumeschattenkopie-Diensts.
Weitere Informationen finden Sie im Anwendungsereignisprotokoll.
Windows Errorlog
0050: 2D 20 43 4D 44 3A 20 20 - CMD:
0058: 76 73 73 61 64 6D 69 6E vssadmin
0060: 2E 65 78 65 20 72 65 73 .exe res
0068: 69 7A 65 20 73 68 61 64 ize shad
0070: 6F 77 73 74 6F 72 61 67 owstorag
0078: 65 20 2F 46 6F 72 3D 43 e /For=C
0080: 3A 20 2F 4F 6E 3D 43 3A : /On=C:
0088: 20 2F 6D 61 78 73 69 7A /maxsiz
0090: 65 3D 35 25 20 20 20 20 e=5%
Error 1
<Data>{0b5a2c52-3eb9-470a-96e2-6c6d4570e40f}</Data>
<Data>Coordinator</Data>
<Data>0x80040154, Klasse nicht registriert</Data>
Error 2
<Data>CoCreateInstance</Data>
<Data>0x80040154, Klasse nicht registriert</Data>
<Data />
Any Idea would be great.
Kind regards

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Thanks for the reply.
I would like to set the size of the shadowcopy by pre-backup command, as backup tasks cause the problem (so they fix it themselves).
Do you have an idea, how to make it work? As mentioned above: CMD and batch files are working, pre-backup is not.
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If Windows scheduler is not an option, please raise a support ticket at https://www.acronis.com/en-eu/support/contact-us/ so that our engineers can investigate why the pre/post commands do not allow using this script.
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