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RAID1
I recommend you to configure RAID1
Because as per my experience with2 HDD you can either choose RAID-0 or RAID-1.
RAID-0 doesn’t support redundancy and commonly it is used for obtaining excellent performance in data transferring by block stripping method.
RAID-1 supports redundancy and you cannot expect an excellent preference as RAID-0 but you can assure that if one HDD failed the data is safe in another HDD. The main disadvantages of RAID-1, you can use only half of the total space and even if it supports redundancy most probably you required down time for the machine because in software RAID, RAID-1 don’t always allow a hot swap for a filed HDD.
In your requirement keeps importance to redundancy so I recommend choosing RAID-1
I choose raid6 bcause it has errorchecking and restoring HDD..Performance for Desktop HDD is more inaf