SugarSync is the world's simplest online backup with remote access, multi computer synchronization and online sharing built in.

• Back up all of your Macs and PCs into a secure personal website that you can access from any computer and your mobile phone
• Keep folders automatically and constantly in sync across Macs, PCs and your personal website
• Access, view and share your files 24/7 from your mobile phone, even when your computers are turned off
• Send any size file no matter how large - from your desktop, the Web or your phone

See here for pricing details.

• You now have even more control over the data you sync with the new sub-folder exclusion functionality. This new functionality enhances SugarSync folder management by providing a tree view of the sub-folders that can selectively be excluded (and re-included).
• We've added a sync priority feature so you can upload or download files you need the most first. You can prioritize an item to be synced by simply marking it with a star.
• The new bandwidth control feature has three different setting levels so you can allocate bandwidth usage as needed. Click here to learn more about changing your bandwidth usage!
• We also brought back Remote Wipe so you can protect your data in the event you no longer have access to your device(s).
• You can now rename computers whenever you want by going into the Preferences tab.
• Improved Windows build stability to reduce crash rate.
• In addition to French and Japanese, SugarSync now also supports Spanish translation.