DIAGNOSTICS BUGS
times are transferred as unix time_t values
When transferring to FAT filesystems rsync may re-sync unmodified
files. See the comments on the --modify-window option.
file permissions, devices, etc. are transferred as native numerical
values
see also the comments on the --delete option
--modify-window
When comparing two timestamps rsync treats the timestamps as
being equal if they are within the value of modify_window. This
is normally zero, but you may find it useful to set this to a
larger value in some situations. In particular, when transfer-
ring to Windows FAT filesystems which cannot represent times
with a 1 second resolution --modify-window=1 is useful.