using rsync for backups - want to run only if changes from last backup

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I use rsync a lot in crontab to back up directories.

with the -ah options I have never had a problem, but recently added -R.

Anyway rsync is very good at figuring out if any files on the source has changed only copying those to the destination.

But now I am doing source directories with thousands of files in multiple sub-dirs that may not see any changes for days on end.

rsync seems to figure this out fast and terminate with nothing to do.

But is there some way to evaluate the source and see if any changes have occurred since the last rsync (or some time) and only trigger rsync accordingly?

Maybe I am just trying to fine-tune something that really does not need it. but maybe I will learn something.

thanks!


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