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What many fail to realize is that there is only need for a wallet backup if you send bitcoins, not when you receive them.
When you send some bitcoins, one or more new bitcoin adresses are created and added to your wallet, to which some additional bitcoins might get sent!
As Blitzboom wrote, the wallet contains a list of 100 new addresses, so in theory you could make up to 100 transaction before this would matter.
This is a feature that is specific to the official client, not to the bitcoin protocol. You could patch the client not to send anything except what you tell it. That would however reduce the anonymity and make it easier to track the flow of bitcoins through the network.
When you send some bitcoins, one or more new bitcoin adresses are created and added to your wallet, to which some additional bitcoins might get sent!
As Blitzboom wrote, the wallet contains a list of 100 new addresses, so in theory you could make up to 100 transaction before this would matter.
This is a feature that is specific to the official client, not to the bitcoin protocol. You could patch the client not to send anything except what you tell it. That would however reduce the anonymity and make it easier to track the flow of bitcoins through the network.
I've been trying to figure out where all these new addresses are coming from. Would it be possible to prevent the client from doing that, or to send from a specific address? This way an address could become associated as "mine" and be trusted, much like people receiving to a specific address continually.
This has been answered elsewhere but, if I'm understanding this stuff, your Bitcoin client creates the addresses itself. Each address has a public and a private key associated with them. The fact that you and only you have the private key makes them, by definition, yours. (Possession is 100% of the Bitcoin law:)
You can use a single address over and over if you want but that makes your transactions easier to track. If you're after anonymity then this reduces it.
