user257: How hard would it be to successfully attack (all) the Electrum backend servers? I think there is about a handful of them. 
I would consider an attack successful that stops Electrum from working for a day or so.

user2734: I'm not exactly sure if this is what you're asking; nevertheless the wiki says: 

Transactions are signed locally: Your private keys are not shared with the server. You do not have to trust the server with your money.
Freedom and Privacy: The server does not store user accounts. You are not tied to a particular server, and the server does not need to know you.

It seems the storage of your keys is client-side, so if they were to get (D)DoS'd you could easily move you keys to another wallet.

257: <p>How hard would it be to successfully attack (all) the Electrum backend servers? I think there is about a handful of them. </p>

<p>I would consider an attack successful that stops Electrum from working for a day or so.</p>
 2734: <p>I'm not exactly sure if this is what you're asking; nevertheless the wiki says: </p>

<blockquote>
  <p>Transactions are signed locally: Your private keys are not shared with the server. You do not have to trust the server with your money.</p>
  
  <p>Freedom and Privacy: The server does not store user accounts. You are not tied to a particular server, and the server does not need to know you.</p>
</blockquote>

<p>It seems the storage of your keys is client-side, so if they were to get (D)DoS'd you could easily move you keys to another wallet.</p>
