Skipping unchanged files

Hello,
I’m new to Comodo.
How can I avoid to copy unchanged files, in “simple copy” mode?
It will be much faster if files unchanged since last run of Comodo are skipped.
My first test (slow) let me think it is not “skipping” by default.
And I didn’t find a place to set the setting this way.

How should I do?

Thanks on forward

P-Y