I’d add a 2nd Pi-hole (sounds like you have one already?) for redundancy.
I wonder if there’s beer on the sun.
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Keep in mind the 64GB is eMMC internal storage while the others (256,512) are NVMe SSD.
eMMC is considered more of an outdated storage option. You’ll probably stick a microSD in (if you only have 64GB) so maybe it’s a moot point.