Exclude destination files/directories form robocopy?

Question

I have a deploy process that is currently using this robocopy command:

robocopy [source] [destination] /MIR /XF [file pattern] /XD [directory pattern]

The [destination] may have additional files or directories added to it outside this process that the [source] does not. The /MIR flag is present because if I add files or directories to [source] I want them to appear in the [destination]. Also, if I remove a file/directory from [source] that exists in [destination] I want to remove that from [destination]. However, this will also remove any of the new files/directories that may have been added to [destination].

The /XF and /XD flags appear to only restrict the source files/directories. Is there a corresponding way to exclude destination files from the copy? Something to indicate "When doing \MIR don't delete directories starting with the string 'new'," for example.

Answer 1

Should have run more tests before asking. It appears that amending the command to be:

robocopy [source] [destination] /MIR /XF [file pattern] /XD [source directory pattern] "new*"

Does, in fact, ignore directories in the [destination] that have "new" as the start of their name.