user5169: I was thinking about a possibility to overcome the 'only stored on one PC' wallet problem! I erase or lose my PC, then I lose all my bitcoins.
Suppose that the wallet, associated with an account number and a strong secret password were backed up on all Bitcoin clients.
What would be the drawbacks/advantages of this solution?

user238: In a way, this is how deterministic wallets work: All keys and addresses are derived from a secret pass phrase. The "wallet" in this case is the description of the algorithm, which is "stored" publicly.

5169: <p>I was thinking about a possibility to overcome the 'only stored on one PC' wallet problem! I erase or lose my PC, then I lose all my bitcoins.</p>

<p>Suppose that the wallet, associated with an account number and a <strong>strong</strong> secret password were backed up on all Bitcoin clients.</p>

<p>What would be the drawbacks/advantages of this solution?</p>
 238: <p>In a way, this is how <a href="https://bitcoin.stackexchange.com/questions/718/what-is-a-deterministic-wallet">deterministic wallets</a> work: All keys and addresses are derived from a secret pass phrase. The "wallet" in this case is the description of the algorithm, which is "stored" publicly.</p>
