“When choosing an external hard drive, consider physical size (for portability, 2½-inch drives travel well), speed (5400 RPM is common for durability, 7200 for speed), and capacity (2TB minimum these days). Reliability varies, and manufacturers seem to cycle from good to bad and back again. Focus on your needs: size of backups, number of backups, additional uses, and, of course, your budget. Backing up is crucial regardless of drive specifics.”
Go to Can You Recommend a Good External Hard Drive? for the description.
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