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Dropbox is the easiest way to store, sync and share files online.

File Sync

• 2GB of online storage for free, with up to 100GB available to paying customers.
• Sync files of any size or type.
• Sync Windows, Mac and Linux computers.
• Automatically syncs when new files or changes are detected.
  

File Sharing

• Shared folders allow several people to collaborate on a set of files.
• You can see other people's changes instantly.
  

Online Backup

• Automatic backup of your files.
• Undelete files and folders.
  

Change Log - Link

- Fix another very rare issue where Dropbox wouldn't start on Windows.
- Give better error message for common Registry issues on Windows.


Download link.

Even its 2GB capacity for starters still its really useful for upload important files. And I have confidence on their security how it was stored in their server.

Dropbox is the easiest way to store, sync and share files online.

File Sync

• 2GB of online storage for free, with up to 100GB available to paying customers.
• Sync files of any size or type.
• Sync Windows, Mac and Linux computers.
• Automatically syncs when new files or changes are detected.
  

File Sharing

• Shared folders allow several people to collaborate on a set of files.
• You can see other people's changes instantly.
  

Online Backup

• Automatic backup of your files.
• Undelete files and folders.
  

Change Log - Link.

• Fix missing Korean Translations
• Better photo importing from Blackberry devices
  

Download.

Dropbox has been updated:

• Link
  

Quote:Mountain Lion support.

Sources.