Using the 7.5.3 client on w2k8 R2 x64 servers worked for me, however it also 
introduces another problem with authentication due to software version 
compatability as I understand it (see esg83259 ) Once the authentication method 
is updated works fine (unless you use the client wizard for configiuration - it 
no longer works after !)

We have full and incremental level backups configured, however even when an 
incr runs it results in a full backup image size. I've found the following 
explanation :

For a full backup operation, specification of the VSS SYSTEM FILESET save set 
or save set All  results in a full backup of the system-protected files. 
However, on an incremental or level 1-9 backup of the VSS SYSTEM FILESET save 
set or save set All, if any system-protected files have changed since the 
specified time, all system-protected files are backed up. If no 
system-protected files have changed, none will be backed up and no 
corresponding save set entry is made in the server's media index. 

95% percent of the time all VSS streams complete successfully, however if there 
are any failures it is the System Fileset. On the cases I've investigated this 
usually down to low resources on the client (RAM usually)

Unfortunately I'm still experiencing very slow throughput, more concerned about 
getting the data at the moment rather than speed ... I believe the slow speed 
is partially due to a large number of small files that make up part of the save 
set.

Hope this helps 8-)

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