Zend certified PHP/Magento developer

Robocopy destination folder not specified

I want to make a backup copy of an entire drive to a folder in an external drive but robocopy doesn’t “see” the specified destination folder.

The idea is to update all the files and add the new ones in the J drive every time I run this command. So the result will be a clone of the D drive at that moment.

What I’m doing wrong?

robocopy "D:" "J:2Tera" /copy:datso /mir /fft /r:0 /w:0 /secfix /mt:20 /xo /xf thumbs.db /log+:J:TON-FS4.log /nc /ns /np /ndl /nfl /tee

Also, Do I need to add /b switch?

A couple of folder are windows backup folders in that drive.(D:)