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I have a usb drive I do local backups onto and then have online backup with idrive.com to backup the data there as well. So files stay on the normal computer and I have redundant backups. Everything is encrypted before uploading to the online backup so it's secure. If you get a 2.5" external drive those generally do not need additional power but the 3.5" ones do, so depending on how much storage you need it's something to think about. Also, if you do have and use a usb 3.0 one, make sure you get a long cable if you use wireless to get internet on the computer. It can put out interference that can lead to slow wireless and drops if it sits to close to the computer antenna (a few feet is good).
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