SnapGear 2.0.1 - Manual (Page 106)

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Set the CyberGuard SG appliance to use the network share
Check Use share. Enter the location of the network share in the format:
\\HOSTNAME\sharename
Figure 8-3
Enter the maximum size for the cache in Cache size.
Warning
Cache size should not be more than 90% of the space available to the network share,
e.g. if you shared a drive with 1 gigabyte of available storage, specify a Cache size of
900 megabytes.
Enter the Username and Password for a user that can read and write to the network
share. If you allowed Full Control to Everyone, you may leave these blank.