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SOS Online is a cloud backup service that differentiates itself from its competitors by holding onto old and deleted versions of your files for all of eternity. Most companies retain these files for 30 days, or 90 days in some instances (enterprise, usually), so going from 90 days to a lifetime is quite a jump, but that convenience comes at a hefty price.
Naturally, cloud backup options vary wildly in price and functionality, but they’re increasingly necessary for peace of mind and data security. I thoroughly evaluated SOS Online Backup along with several other leading packages based on three main criteria: pricing, features, and performance.
Source: IGN.com SOS Online Backup Review