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HDD or SSD?
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HDDs are for cheap, not for reliable. Anecdotal, but my personal failure rate with HDDs is around 98% while my failure rate with all forms of flash media (including SSDs) is around 2%.
With 1 TB SSDs being available for as little as $20 (not particularly fast ones but still far faster than HDDs), I don't see a use-case for HDDs at all unless you need dozens of TBs of storage.
Of course anecdotes are of very limited usefulness, but I had exactly the opposite experience. The HDDs that failed on me, failed slowly with SMART errors that gave enough time to make a backup, and never failed completely. On the other hand I had a cheap SSD die completely and without any warning after only limited use, and experienced bit rot even on reputable vendors.
tl;dr choose what you want but make backups