External vs Internal HDD for backup purposes?
An Internal HDD has the advantage that you can see your data safely all the time, but I'd think that storing the data on an external HDD in a cabinet, or somewhere safe place probably makes the HDD live longer. Is that so? Or not really?
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Use internal drives with a dock and store cold. Saves the hassle of dealing with a bunch of cases and power adapters.
For fully on backup all the time use a versioned backup like time machine or a cloud service.