There are so many online file storage services these days that you can find yourself lost in the herd. To help you narrow down your choices, I recommend that you visit I Love Free Software where they have a table posted that is an exhaustive comparison of the 15 best FREE cloud storage services (i.e. Dropbox, Google Drive, Box, OneDrive, Tresorit, DataBagg, Bitcasa, ASUS WebStorage, IDrive, MEGA, pCloud, Inbox Storage, Copy.com, SpiderOak, and FlipDrive).
I am very familiar with everyone of these services and can tell you that the cross comparison table that I Love Free Software has compiled is of great value; especially, if you do not know what services to use.
What I am finding, even with myself, I have signed up with many of these services and before I knew it I was losing track of what I had stored and where. My recommendation, is keep it to one or two services, focus on organizing your files and focus on encrypting any sensitive files that you intend to store online.
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