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How to use 'cp' as a simple but reliable backup tool
Authored by: Hal Itosis on Feb 18, '10 08:35:14AM
It's touted as a two-way syncing tool.
Two-way syncing tool?!? No... it's not. And this is the first time i've heard that particular misinformaton being touted. (if anything, people sometimes complain that rsync *doesn't* do bidirectional syncs). Perhaps you're thinking of of Unison.

Unless I understand it, I'm not trusting it to leave my source files alone. I think you'd agree the prospect of deleting your only copy of a photo while intending to back it up is the definition of a pretty bad day.
Folks are far more likely to accidently delete stuff by not properly escaping\ a\ space\ in some pathname, than risk their source files when running rsync (and somehow adding the --remove-source-files option by "mistake").

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