can rsync scan files only with mtime since T?

[Ming Zhang]

Hi

I have a file system that contains millions of small files. Since I
backup it everyday with rsync using slow WAN link, I think it will be
nice that if rsync can do this:

An option that let rsync only check with remote rsync daemon about local
files that has last modification time newer than one day ago (so is
modified since yesterday backup). This can greatly reduce the WAN
traffic.

Is this doable with current rsync?

Thanks!


-- 
Ming Zhang


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