How to copy files from Yun to local computer?
You simply reverse the arguments.  Whatever you used to copy a file to the Yun you just do the opposite to copy from the Yun.

For instance, if you copied to the Yun using:

scp /my/local/file root@192.168.2.16:/where/you/want/it


Then you would change it around to copy from the Yun thus:

scp root@192.168.2.16:/path/to/file /where/you/want/it/to/go