Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

I am using Time Machine with an external drive connected to a Macbook running Mountain Lion. I use backup encryption.

Whenever I connect the external drive TM asks for my password. The password I'm sure I used doesn't work, nor any others I've used in the past. However, it still backs up when I choose 'Backup now' and I appear to be able to use Time Machine to view old files in other backups!

Any ideas what may be causing this?

share|improve this question
    
This seems to be a mix-up with the Key Chain. As soon as I enabled adding it to keychain it accepted my password and stopped asking to re-enter it. On removing the recently added item in the key chain it started asking again. It seems Time Machine can get into a state where it both recognises you have a valid keychain, but also asks for a password. –  Tony Sep 2 '12 at 9:58
    
It's possible you had multiple conflicting keychain entries (e.g. one in your personal keychain and another in the system keychain), and one of them was the wrong password... –  Gordon Davisson Sep 2 '12 at 15:03
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.