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One of the more common strategies for backing up a personal computer is to copy files to a USB drive, which can include towering storage arrays like the Western Digital My Bookor a low-profile portable drive. If you're following the 3-2-1 rule, a USB drive is a perfectly good way to make a local backup. However, a detachable storage solution like a USB drive fails to provide the protection that a different medium might, as your USB drive files could still be infected with ransomware.

This is similar in principle to why RAID isn't considered a proper backup, as it's possible for both local copies to be destroyed at the same time. Most variants of RAID make a copy of your data on the fly, but both can fail if a certain combination of drives fails simultaneously. Similarly, files on USB drives can become simultaneously corrupted by simply having your working copy become corrupted and then backed up. Further, your backup files can be vulnerable while the drive is connected. Still, backing up to a USB drive does create an extra copy that will protect against most problems, like drive failure or accidental erasure, and it's a legitimate part of a backup plan.

One note about portabledrives don't carry your backups around. If you're physically moving an off-site backup somewhere else, move it and be done. Don't expose your backup to all the weather, car crashes, theft, and other risks portable drives introduce.

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The Best Ways To Back Up Your PC Data - SlashGear