Perhaps by spending the coin you put your backup copy of the wallet in a state where it disagrees with "the network". In which case he's making a very important point: backups are not enough, they have to be realtime synchronized backups.
Your key pairs are still valid, though, and they're in the backed up wallet. If those 9k were purchased and a few confirmations were achieved, then everyone with the current block chain will recognize your keys.
That the client is problematic doesn't mean the data/$ is gone.
Except he doesn't have the keys, because the transaction generated a new keypair for the remainder left post-transaction. The new key didn't get backed up because it didn't exist at the time of the last backup.
Comments
Perhaps by spending the coin you put your backup copy of the wallet in a state where it disagrees with "the network". In which case he's making a very important point: backups are not enough, they have to be realtime synchronized backups.
Your key pairs are still valid, though, and they're in the backed up wallet. If those 9k were purchased and a few confirmations were achieved, then everyone with the current block chain will recognize your keys.
That the client is problematic doesn't mean the data/$ is gone.
Except he doesn't have the keys, because the transaction generated a new keypair for the remainder left post-transaction. The new key didn't get backed up because it didn't exist at the time of the last backup.