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My backup private keys were made in Jan and my computer crashed in May. If I upload the keys on a new wallet, will it show my bitcoin balance from May or January?

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  • How many transactions do you make per month? – Nick ODell Jan 26 '15 at 16:59
  • One or two every couple of months. The Jan balance and the May balance were definitely different. – Kris Jan 26 '15 at 17:31
  • If you didn't créate any new private key during this time, then I would say it's safe to use. – Arturo Torres Sánchez Jan 26 '15 at 17:31
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Bitcoin-Qt has a feature called "keypool." It pre-generates 100 keys and includes them in all of your backups. This way, if you make a backup, it will also include the keys you're going to use in the future.

In general, sending a payment consumes an address, and receiving a payment consumes an address.

If you make 1 transaction a month, 100 keys will last 8 years.

However, if you change your wallet password, you must make a new backup.

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