The question isn't if you're going to lose data—it's when. You need to be backing up and you need to be using a reliable product to do it. After testing plenty that let you store data on the Web or locally, we gathered together the reviews of the best.

In This Roundup:

SOS Online Backup 1.3 (beta)
Backs up your files continuously (even locked ones), keeps them safe off-site, and retains all versions indefinitely.

Mozy Remote Backup 1.6 (beta)
Backs up files even if you're working on them. Gives you up to 2GB of remote storage for free; beyond that, fees are about one-tenth the going rate.

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Stardock KeepSafe 1.0
Retains up to 50 previous versions of files you're working on, storing them locally on a network, and makes finding the older versions easy.

NTI Shadow
No more scheduled backups (unless you want them). Every time you save a file to the hard drive, the utility makes a copy to a local device or network.

Want more reviews on all kinds of security software? Go to our Backup Software Product Guide