If I install OpenWrt on a Raspberry PI what size of MicroSD card do I need?
Is it better to get a dedicated MicroSD so I do not have to wipe the one that came with it?
~100MB or bigger.
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You can't even buy a SDcard that would be considered too small for openwrt nowadays.
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Under 2tb, or under 256gb on early pi-s
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As others have said, you only need a small amount of storage for most purposes. Pretty much anything you can get these days will be fine... go with the smallest cost-effective option (i.e. there is often a 'bathtub curve" of pricing -- don't pay more for a small card (or a high cost per gigabyte), but get the size that is the sweet spot before it starts getting more expensive again).
I'm looking at Amazon US and seeing decent 32GB and 64GB cards for <$7 USD.
This is up to you. But with how cheap the cards are, you might want to have a few lying around so you can quickly swap out OSs or make experimental setups on different cards.
They're so cheap
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