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Javax.crypto.BadPaddingException

If when opening the backup client you receive the below message, try deleting the config folder called.obm for the Business Backup Client or .acb for the Single User Backup Client.

The folder can be found in c:\users\userprofile\

The folder contains user information and the encrypted encryption key.  After deleting the folder, when you reopen the backup client, you will be prompted for your username and password then once logged in, you may also be prompted for your encryption key(s).