I couldn't find anything when I checked...
Oh, man. I didn't realize the -a argument was to look inside an archive. Not sure what I thought it was for. The Linux command docs are kind of weak on explanations. This is a great solution that will no doubt come in handy. I really had no idea you could extract just part of an archive at the CLI. Makes sense.Usually we just copy the files from /backup to /home that we need so that the entire site doesn't need restored which avoids using WHM which will reload the entire site.
cd /backup/cpbackup/daily/user/homedir/public_html
cp -af somedir /home/user/public_html/somedirTEST
this adds a temp dir called somedirTEST while leaving the original "somedir" in tact on the live site.