"best" size depends on your needs & budget.

For example, if your budget is infinite, a 512GB card would be a good start.

If you are on a budget, you just calculate all the space your servers, including Bitcoin nodes, etc. would need & add like 35-60% size on top.

However, if you really need the entire Bitcoin Blockchain, you need at least a 1TB #microSD.

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Thanks for replying! Wish they made a bigger SD card. I am not a linux genius but can you tell a program where to store/install the data like you can in Windows?

Start 9 and Umbrel make it easy. Just don't run too much on a raspi. I run an Umbrel on a raspi and Start9 on an OptiPlex. You don't need to learn linux/bash. You just need Balena Etcher.