- Dropbox offers you 2GB of free storage that you can expand to a full 16GB by referring others to the service. Because Dropbox also syncs files to your other computers and makes your files easily accessible on your mobile devices, it's a good candidate for your primary work files.
- SugarSync offers 5GB of free storage (sign up here) and syncs files just like Dropbox. While I prefer Dropbox, SugarSync has a bunch of features Dropbox does not at it's especially good at handling media files or any files on your hard drive (while Dropbox only really syncs files inside your Dropbox, unless you circumvent that limitation). SugarSync is a good option for syncing important files that you keep outside Dropbox, but I think is especially good for your photos. While Dropbox has photo viewing options, it's not quite as robust as SugarSync. If you have photos you want backed up and can keep them under 5GB, SugarSync will handle them very well for free.
- Amazon CloudDrive gives you 5GB for free, or 20GB if you also purchase an album(which you can find on Amazon for as low as 89 cents). It's a great option for storing your music because of Amazon Cloud Player, which lets you access your music (assuming it is DRM-free) from anywhere. Also, if you buy music directly from Amazon it doesn't count against your storage.
- Windows Live SkyDrive isn't great for backup purposes, as all files need to be under 50MB, but you do get 25GB of storage for free and that makes it great for archiving documents. You'll have plenty of room and can use Windows Live Mesh for backup and synchronization purposes if you're on a Windows computer. Mac users will have to backup manually through the site, but that's a small price to pay for 25GB of storage.
- MemoPal offers 3GB of free cloud storage and gives you more space through referrals in the same manner as Dropbox. It's capable of automatic backup and runs on Mac, Windows, and Linux.
- ADrive offers 50GB of storage for free. You won't get any sync or auto-backup options, so it'll make for a better file archive than anything, but it's still 50GB of free online storage.
- IDrive offers 5GB of free storage and automatic backup for Windows and Mac. It also has smartphone apps so you can access your files remotely.
From lifehacker
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