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Full disclosure: If you use Oliver's code, he'll get a $5 referral fee from Spanning Backup. He recommends using their 14-day free trial to test-drive first.
I have a friend who uses CloudPull to back up Google info. Read more about that option:
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Backing up DropBox.com and the like
One easy way to protect your DropBox data is just conduct normal backups of local files, with the ability to restore from specific points in time.
Alternatively, here are some promising, but untested-by-ChemIT, tools and services:
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