A whole line of "portable" external hard disks (usually USB-powered) are available, sized perfectly for travel, and are often no larger than the size of the power brick they carry.

If a person who needs critical backups of content on their laptop doesn't have one, their data isn't as "critical" as they think.

Backing up to the same internal hard disk is just a waste of space that could have been part of the main partition.

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