do I always have to use either --checksum or --times ?

Hello,

I want to sync local folder to remote server. When I run follwing
command repeatedly, it always transfers everything each time again and
again:

   rsync --rsh='ssh' foo/ server:/foo/

does it mean I have to always use either --checksum or --times, to
prevent repeated transfer of files that have not changed ?

thank you,

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