I need a suggestion for an alternative type of backup device to replace tape drive
closed as off topic by jscott, rnxrx, Michael Hampton♦, Chris McKeown, Ward Sep 19 '12 at 18:34
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How much data do you want to back up? External hard drives are the obvious choice, if one drive isn't enough, you can easily get enclosures that hold 4 drives, e.g. these ones. The title of your post says portable and you can also get external tape drives. Those would typically be SCSI, however, not eSATA.