CCC stores authentication credentials that facilitate automated backup tasks in the macOS System keychain. Specifically, CCC will store these sorts of credentials:
- SMTP account settings that you define in CCC's Preferences > Email Settings
- NAS device username/password for mounting NAS volumes specified as a source or destination to a CCC task
- Encrypted volume passwords that you ask CCC to store
- Encrypted disk image passphrases for disk images that you ask CCC to create
You can remove individual keychain entries, or reset the CCC private keychain
If you would like to see and/or remove individual keychain entries, open CCC's Settings window and click Passwords in the toolbar. To remove a keychain entry, simply select the entry and press the Delete key. Click Reset Keychain to remove all CCC-created entries from the System keychain.
You can also see CCC-created keychain entries in the System keychain via the Keychain Access application. Open Keychain Access, then select the System keychain in the sidebar. All CCC-created entries are prefixed with "CCC".