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I use the win7 backup system at least every 2 weeks just to have a backup for that more or less not so reliable ATIH 2011.
avast! so far did not give me any trouble at all during win7 backup or restore and this is true for any released or beta version. Also during the backup I can continue working with “MS Office 2007” without even recognising the parallel running backup.
Shadow copies or system restores are working perfectly together with avast!
So from my experience I could not blame avast! for doing any bad to the system.