2 interal hdd vs 1 internal + 1 external hdd

I'm looking to get another drive for my computer and I'm wondering what would be the better choice for me. I'm looking to get another internal hard drive for backup and when one fails I could use the 2nd internal hard drive.

My other option is to get an external hdd and use that as backup but then I when the internal hdd fails I won't be able to go online.

so I'm wondering since the 2 internal hard drives are in the computer at the same time, is it likely for them to both fail at the same time?
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  1. Best answer
    It is very unlikely that two drives fail at the same time! More problems with external than internal, based on volume in use.
  2. Best answer selected by qwerty123z.
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