I keep all my stuff backed up on external drives, but I am thinking about making a mirror image of my hard drive. I have never done this before. How do I figure out what size of external hard drive to use to do this? I plan to get one for the mirror image only, and would like to update it at least once a month. I will be adding some stuff through the year and would not want to out grow the external, but I dont want to get one too small either.
Any other tips for doing this would be helpful.
Thanks
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