I just did an ADRAP and one of the things identified is a large number of backlogged files for SYSVOL on my RODCs. We still use FRS for our SYSVOL, we have a mix of 2008 and 2008 R2 RODCs, and they are all showing a high number of backlogged files. The R2 systems are showing a higher number actually, even though they are newer RODCs, and haven't been in the environment as long.
I have a couple questions
1. Is this even a problem? SYSVOL doesn't replicate from the RODC out to a WDC
2. If it is a problem, how can I troubleshoot this? The FRSdiag tool looks pretty slick, but according to the download link (http://www.microsoft.com/en-us/download/details.aspx?id=8613) it is only supported for server 2003.