Dropbox is a very good online file backup and synchronization service. it’s client can be installed on windows, linux, mac, iphone, android etc. other platforms and mobile devices can still access the files via browser. The main advantage of Dropbox is that it automatically synchronizes the files which you place in it’s shared folder to all the computers which has the same sync relationship.
Dropbox provides 2GB of online space for free which can be upgraded to a pro account if you require more space at a later time. Uploading files to dropbox is very fast and easy.