[rsync] get the differences between the source files and the existing files
I want to know the amount of data that rsync will transfer over before rsync actually does the transfer. (like a --pretend flag)
The reason is because if the transfer is going to be large I might wait and do it later, and if the transfer is only a few megabytes then I might do the rsync now instead of later.
thanks,
djgerbavore
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