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

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On 7/11/25 11:00 AM, Joe Average wrote:
Robert Moskowitz wrote:
...
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?
filtering/investigating the output of rsync's "--dry-run" option ?
The whole point is to reduce rsync activity.  Dry run is a complete compare of the source and destination.

It may just be a mental exercise and not worth it.  Every night I have an rsync job that downloads the latest Internet Drafts.  There is currently 168694 files in my download directory.  So every night rsync is comparing that to what is in the IETF repo with:

rsync -tvz rsync.ietf.org::id-archive/*.txt /home/common/ietf/drafts

So what am I concerned about backing up a dir tree with a couple thousand files?

Learning....

:)

And why do I maintain a complete copy of all IDs?  At least the txt ver?  Because!  And I have needed them on flights to whereever.

Also have all RFCs.  On a call today, I had to bring up two to look at.  Much faster than going to datatracker.

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