Most (all?) HDDs made since 2023 are helium filled. Not only are they sealed but they run cooler with tighter tolerances. I wouldn't buy any that are not.

The key to any backup scheme is to have multiple copies. Besides Apple Time Machine, I use Backblaze. My HDDs are used for backup only and they are replaced when the 5 year warranty is up. My only data loss was in 1986 when my very first 20MB HDD died. I was able to use a tape recovery system that I had bought with my Mac Plus to retrieve all but my last 120 invoices and those also existed on paper so I was good after a bit of manual reentry into FileMaker Plus. Lesson learned.

These three WD icons are my three WD MyCloud arrays with 22TB helium filled HDDs backing up my entire network over Ethernet and/or WiFi. My two desktop machines each have an additional TM box for that one Mac.

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BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5