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I would like to have a synchronized copy of one folder with all its subtree. It should work automatically in this way: whenever I create, modify, or delete stuff from the original folder those changes should be automatically applied to the sync-folder. Which is the best approach to this task? BTW: I'm on Ubuntu 12.04 Final goal is to have a separated real-time backup copy, without the use of symlinks or mount. I used Ubuntu One to synchronize data between my computers, and after a while something went wrong and all my data was lost during a synchronization. So I thought to add a step further to keep a backup copy of my data: I keep my data stored on a "folder A" I need the answer of my current question to create a one-way sync of "folder A" to "folder B" ( cron a script with rsync ? could be?). I need it to be one-way only from A to B any changes to B must not be applied to A. The I simply keep synchronized "folder B" with Ubuntu One In this manner any change in A will be appled to B, which will be detected from U1 and synchronized to the cloud. If anything goes wrong and U1 delete my data on B, I always have them on A. Inspired by lanzz's comments, another idea could be to run rsync at startup to backup the content of a folder under Ubuntu One, and start Ubuntu One only after rsync is completed. What do you think about that? How to know when rsync ends?

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