You can try the complete feature set of CCC for 30 days before purchasing it (no features are disabled during the trial). We encourage you to use that time to explore CCC's automated, incremental backup functionality and make a bootable backup.
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If you have any questions about the behavior or functionality of Carbon Copy Cloner either during the demo period or after purchase, you can select Ask a question about CCC... from Carbon Copy Cloner's Help menu.