The xbcrypt binary overview

To support encryption and decryption of the backups, a new tool xbcrypt was introduced to Percona XtraBackup.

This utility has been modeled after The xbstream binary to perform encryption and decryption outside of Percona XtraBackup.

The XBCRYPT_ENCRYPTION_KEY environment variable is only used in place of the --encrypt_key=name option. You can use the environment variable or command line option. If you use both, the command line option takes precedence over the value specified in the environment variable.