user130990: If I insert a passphrase to a wallet.dat file but also save copy of it before the passphrase, and then make a transfer to it, will I be able to use the old wallet version (Without the passphrase) to spend it?
In other words, does the private key somehow changes when you insert passphrase to a wallet.dat file?

user51948: When encrypting a wallet, the wallet will generate new keys. If you transfer to those keys, the old, unencrypted backup will not be able to spend the funds. Only the encrypted wallet will have the private keys. Thus, after encrypting, you should take a new backup.

130990: <p>If I insert a passphrase to a wallet.dat file but also save copy of it before the passphrase, and then make a transfer to it, will I be able to use the old wallet version (Without the passphrase) to spend it?</p>
<p>In other words, does the private key somehow changes when you insert passphrase to a wallet.dat file?</p>
 51948: <p>When encrypting a wallet, the wallet will generate new keys. If you transfer to those keys, the old, unencrypted backup will not be able to spend the funds. Only the encrypted wallet will have the private keys. Thus, after encrypting, you should take a new backup.</p>
