Not traversing x:\xxxxx since it's of type 'REPARSE_SYSTEM_DIR_JUNCTION

These are informational messages. Junction points are similar to symbolic links on Linux. It's basically a pointer from one filesystem location to another.

The Avamar client will back up the junction point itself but will not back up the contents on the other side of the junction because that may lead to the same data being backed up more than once. For a junction to be valid, it must point to data that is part of the actual filesystem (e.g. a file or directory) and the client assumes that if the contents of a junction target are important, they are already being backed up as part of the dataset. For example, if there were a symbolic link from "C:\Documents and Settings" to "C:\Users", the "C:\Users" directory would already be backed up as part of the regular C drive backup unless it were specifically excluded so there would be no need to backup the same data through the "C:\Documents and Settings" junction.

I hope that clarifies things.