Compression when encrypting the output of tar?

[Chris De Young]

Am I correct in thinking that tar already compresses data and that I am 
better off using "--compress 0" when using GPG to encrypt the output of tar 
on the fly?

(I'm using:

$ tar -cvf - /dir | gpg --symmetric --cipher-algo AES256
			--output encrypted-tarfile.gpg

)

Thanks!
-C
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