For a drive to be a true backup drive, it must be kept powered down, disconnected from the computer, and stored out of sight of the computer except while updating the backup. For most people, this is on the drive, on an onsite external backup drive, and on an offsite external backup backup drive. The only way to reasonably ensure that data will be safe is for it to exist in at least three separate places. Viruses and other malware, fire, flood, theft, user error, etc. Also, drive failure is not the only way to lose data. For starters, any drive, no matter its agge or condition, including new drives, is subjecto sudden, irrecoverable failure with no warning.
While drive reliability is higly desirable, anyone who depends on it to protect their data is a fool.
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