An SD memory card that backs up data is nothing special.
But when it comes with software to automatically back up pre-designated files and folders, it is unique.
Sony's proprietary Real-time Backup Utility makes backup copies of files, which can also be encrypted.
There is a 30-day trial that allows this software to be used with SD cards made by other companies. After the trial period ends, it will work only with Sony SD cards.
How much: $42.90 (16GB), $69.90 (32GB), $129.90 (64GB)
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