You can't be too carefully. Even god don't know when the whole world would fall into pieces, like the program crashes. So it's absolutely necessary to always backup what's important, 'coz nothing is supposed to last eternally, including this sentence~:-). Anyway, here's the habits when I touch things from time to time.
Take rc.conf as an example for an vivid convention explanation.
At first, there's only one rc.conf file in /etc/ directory. One day, which will come earlier than we expect, we need to modify it, that's exactly when we create a backup in case our modification bugs or even destroys the OS.
cp /etc/rc.conf /etc/rc.conf.bak
In this way we have the chance to turn things back to the state just as before by just overwriting corrupted one with our back up.
Then when modify it, changed what we want to. After we are sure that it does what we expected, we do another back up.
cp /etc/rc.conf /etc/rc.conf.cur
We do so because sometimes someone may accidentally overwrite our modified version. If that happens, the current version is the quick rescue, freeing the labour of typing everything again.
Note that when you have to change system configuration files, either enter su mode, or preceed the command with sudo if you have installed that utility.
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