Share vs volume protection

I am currently protecting a set of user shares across sites globally distributed.

All data I need to protect are stored in one share. So I chose to select the users share, thereby automatically protecting everything within that share - perfect.

Now I need to exclude an underlying folder from protection, however this does not seem to be possible. If I had chosen to protect the share, using volume protection, it seems I would in fact be able to keep extending the protected folders and excluding seperate underlying folders.

I read these to post before I originally setup the configuration, however this behaviour is not mentioned:

http://technet.microsoft.com/en-us/library/ff399063.aspx

http://social.technet.microsoft.com/Forums/en-US/dpmfilebackup/thread/27e8b4ef-4575-43ff-9168-8a049b103e03/

So this brings up two questions:

• Is this behaviour expected or am I missing something?
• If I change the protection of these data (within the protection group), from share to volume, what will happen on the DPM server, will it recognise the data, do some reconfiguring and run a cc and be done, or will it start all over again by creating a new replica, new retention cycle etc.

Any input is appreciated, thanks.

/clja