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Carbonite is not cheap, but it's very convenient. You run a Carbonite program on your computer (Windows or Mac), and Carbonite automatically uploads backup copies of your files to its online storage. If something happens to a file, you can log on to the Carbonite website and get it back.
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Google Drive is Google's online storage system. You log in with the same account as Gmail (if you use Gmail for your email). You can open your Google Drive documents in Google Docs (an online word processor), Google Sheets (a spreadsheet program), and Google Slides (a Powerpoint-like presentation program) — all for free.
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Dropbox enables you to store files online. A free account gives you 2GB of storage. You can upload and download files from the Dropbox website or install an app on your computer, smartphone, or tablet to access your files.
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OneDrive is Microsoft's equivalent to Dropbox.