Dropbox
The Dropbox is a real favorite providing the first 2 GB for free.
You load a small Dropbox program on your computer and define a Dropbox folder.
You also open an account with Dropbox and attach with userID and Password. Anything you put in the Dropbox folder on your computer will be replicated across the web to your account on the Dropbox server. So Dropbox has a complete and up to date copy of the files on your Dropbox folder.
Sounds simple and it is. But there is more. Dropbox lets you attach to your account on their server from multiple computers. The Dropbox folders on all these computers will be synched with the server anytime they attach to the service.
If two people change the same file at the same time, Dropbox won't try to merge the changes. Instead, it will save the original file as well as a second version which has the same name but is appended with "conflicted copy," the name of the person or computer responsible, and the date the conflict occurred. By creating a conflicted file, Dropbox ensures that all changes are preserved and nobody will overwrite another person's hard work.
Conflicting changes are saved separately
Conflicted copies can also occur when a file is left open on another computer, especially when using applications with an auto-save feature. Closing the file from within the application on either computer should prevent further conflicts.
