it's most likely because of vfat timestamp limitation
try --modify-window When comparing two timestamps, rsync treats the timestamps as being equal if they differ by no more than the modify-window value. This is normally 0 (for an exact match), but you may find it useful to set this to a larger value in some situa- tions. In particular, when transferring to or from an MS Windows FAT filesystem (which represents times with a 2-second resolution), --modify-window=1 is useful (allowing times to differ by up to 1 second). roland Am 21.01.24 um 22:15 schrieb Ian Z via rsync:
I am trying to use rsync between two local directories on Linux. The source directory is on a normal ext4 partition, under my home directory. The destination is an SD card that I insert into the card reader on the computer, formatted with a vfat filesystem. The command line is like rsync -avC --delete /home/itz/foo/ /media/itz/DEAD-BEEF/foo/ This does not work as I expected: all files are always transferred, even when I run this command 2 times with nothing in between. I expected only new or changed files to be transferred. Is this - a user error - a rsync bug - a limitation of the vfat filesystem? In any case, what can I do, using rsync or possibly something else, to do what I want? I note that the absolute timestamps on the files are unimportant; I can change them to whatever. All that matters is that new and changed files are copied every time I run this command, and only those files.
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