There are generally two types of data backup: backing up your important individual files at the end of every working day, week or irregularly. The other option is to backup your entire drive or drive partition, so that if you suffer from a system crash, you can quickly restore the entire drive.
However, it's an easy process. You don't have to backup your entire drive each time. Simple use incremental or differential backups to backup data changed since the last backup. Also, you could just backup, say, your work or music partition. You don't want to lose the music you've downloaded from the Internet. Another option is to install Windows, all your key apps, then make a backup point so, instead of re-installing Windows, you could just restore this backed up restore point.
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