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You should always stress test a new harddrive when you buy it.
Some people say, "Just hook it up for a few months and keep unimportant data on it. If it breaks in that 1-3 month time then it will be good for 3 or 4 years."
While that metric is okay at best I prefer to take a more systematic approach to it. I want to fill the whole hard drive with random 1 and 0 over a constant and long period of time. I do that because you are stressing the hard drive out...
I run the following command when I want to just update one directory to another. It only copies files that have changed. If any files have been deleted from A they still exists in directory B. The trailing slash after A/ is necessary to tell rsync to move the contents. Otherwise A will create a folder in B called /media/B/A and move the files over.
rsync -ruptv /media/A/ /media/B
I run the following command when I want to mirror one directory to another. Any files...