Can I eliminate diagnostic messages from cp

[lostbits]

I use cp as my backup tool from disk to USB. There are maybe 40,000 
files involved and each one has a message of
"cp: preserving permissions for <file>’: Not supported". These messages 
slow down the backup and obscure meaningful faults. Is there any option 
for removing the messages?

My command line is: cp <directory> /<usb>
thanks
art


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