Scan network file - Urgent

Hello,

I have a problem with Avast server Ed. installed on a sbs2003. I use as backup software acronis. It makes a backup on a NAS but avast is scanning the image file on the NAS when then backup is running. Then the backup stop due a “write problem”.
There is no mapping on the server to the NAS.
So is it a way to tell to Avast that he must not scan files on the network or files that are going from the server to another computer ?
I have event id90 error from avast in the windows logs.
Please help … it’s quite urgent because we can’t make any backup …

Thanks a lot in advance !

maybe you can put the extension from the backup file in the exception list to not be scanned?