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Well I try not to do it at all unless I can't resolve a reoccuring annoying problem. Usually only when I upgrade I tend to swap parts and hdd's around.
If someone somehow infects my comps with a virus I reformat. If some problem keeps occuring all the time I reformat. Mind you I have a hdd specifically for OS usually. So I don't lose all my data. Just need to reinstall programs which is time consuming, but like 90% of software I use very occassionally so never in a rush to reinstall anyways
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