I see from the original post you thinking that you should backup when you receive payment, which is incorrect. The ownership of Bitcoins is recorded on the blockchain, not in your wallet. You only need your wallet to spend the bitcoins you own.
Every time you create a new Bitcoin address to receive bitcoins, and almost every time you send bitcoins, a new address is taken from the reserve pool of addresses - spare addresses that are in your wallet but not shown to you. When the reserve pool of 100 addresses is used up, new addresses will be created by Bitcoin that aren't in your backup. This will result in lost money if you need to restore your backup. Therefore you should make another wallet backup regularly, after sending ~50 transactions or creating ~50 new receive addresses.
To backup, simply use the "backup wallet" option in the file menu.
Every time you create a new Bitcoin address to receive bitcoins, and almost every time you send bitcoins, a new address is taken from the reserve pool of addresses - spare addresses that are in your wallet but not shown to you. When the reserve pool of 100 addresses is used up, new addresses will be created by Bitcoin that aren't in your backup. This will result in lost money if you need to restore your backup. Therefore you should make another wallet backup regularly, after sending ~50 transactions or creating ~50 new receive addresses.
To backup, simply use the "backup wallet" option in the file menu.
That is the correct advice. Ignore other advice on this thread
