How do I backup applications?

Put copies of them on an external drive formatted as Mac OS Extended, or use a product such as the Disk Utility to clone your entire system to that drive. Backing up only the applications won’t preserve their data.

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Time Machine, CarbonCopyCloner, SuperDuper, Time Capsule, Cloud backups.

see > http://www.macworld.com/article/2855735/the-paranoid-persons-guide-to-a-complete -mac-backup.html