rsync vs grsync - are they the same?

[geo_c]

I've been enjoying using Midnight Commander and lynx to manage my system so much, that I decided to see if I could use rsync from the command line, so I fired up my usual grsync configuration and got the command line code by selecting File>rsync command line.

I entered the command that it gave for my configuration:

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rsync -r -t -v --progress --delete --modify-window=1 -I -H -s /mnt/home/dbox.sync.mir /mnt/sdb1

Instead of taking less than an minute to update the files on my backup drive, like it usually does, it appeared to copy a majority of the files and spent a good deal of time doing so. This confused me. I was under the impression that grsync is simply a gui that generates an rsync command, especially since there's an entry for it in the menu.

Apparently there's a difference I should be aware of, or not? I'm guessing it has something to with the --modify-window=1 which the help page says sets the accuracy of the mod-time comparison.