Quote from: Aggravated-Top on Today at 08:56:07 AM

although I don't really know how "knowing which addresses belong to the same wallet" would be harmful or not

My usual anser is: "it depends". If you want to be absolutely sure no chain analysis company can access this data, you shouldn't use a public Electrum server. But considering Electrum's popularity, I don't think that's a concern to most people.
When you use Bitcoin Core, you can also reduce your privacy by linking different addresses together on-chain.

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on the fly space is 12 GB but data download has to be 720 Go anyway, isn't it ?

Correct.

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And how much Go is the blockchain update by month, once first pruned is ok, is it ike 10 Go new data download ?

I think it's about 1-2 GB download per week. But if you allow incoming connections so your node is also uploading, you can transfer much more data.

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"Bitcoin Core is indeed more private, especially if you run it over VPN/Tor."
--> will try my best to go for it

As always, privacy comes at a cost. I wouldn't do it with less than 16 GB RAM, and memory consumption only gets worse in the future.

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Have you heard about AirGap ?

A quick search shows it's "an offline phone". I wouldn't risk my money on that.