Drop Box

I am using Mac Air 11inch which has small capacities available. 

I have lots of assignments that make my MacAir always run out of more spaces. 

I am always back-uping my all assignments to USB, GoogleDoc, NYU Email, 

however

I still feel that it is not enough. 

Recently, I introduced from my friends, there is Drop Box and a lot of students recently use this. 

For the person, like me, I am introducing Drop Box!!

Dropbox description:

Dropbox lets you bring all your photos, docs, and videos anywhere and share them easily. Access any file you save to your Dropbox from all your computers, iPhone, iPad and even the Dropbox website!

It is available in Iphone, Ipod touch, iPad, and Android.....!!!!

Dropbox from Wikipedia.org
: I took only description part and Technology part !! (hoped and tried to understand)

Dropbox is a file hosting service operated by Dropbox, Inc., that offers cloud storage, file synchronization, and client software. Dropbox allows users to create a special folder on each of their computers, which Dropbox then synchronizes so that it appears to be the same folder (with the same contents) regardless of which computer is used to view it. Files placed in this folder also are accessible through a website and mobile phone applications.

Dropbox, Inc., was founded in 2007 by MIT students Drew Houston and Arash Ferdowsi, as a Y Combinator startup company.

Dropbox provides client software for Microsoft Windows, Mac OS X, Linux, Android, iOS, BlackBerry OS and web browsers, as well as unofficial ports to Symbian, Windows Phone and MeeGo.

Technology

Both the Dropbox server and desktop client software are primarily written in Python. The desktop client uses GUI toolkits such as wxWidgets and Cocoa. Other notable Python libraries include Twisted, ctypes, and pywin32. Dropbox ships and depends on the librsync binary-delta library (which is written in C).

The Dropbox client enables uses to drop any file into a designated folder that is then synchronized with Dropbox's Internet service and to any other of the user's computers and devices with the Dropbox client. 

Users may also upload files manually through a web browser. 

Dropbox client supports synchronization and sharing along with personal storage. It supports revision history, so files deleted from the Dropbox folder may be recovered from any of the synced computers. Dropbox supports multi-user version control, enabling several users to edit and re-post files without overwriting versions. The version history is by default kept for 30 days, with an unlimited version called "Pack-Rat" available for purchase.

The version history is paired with the use of delta encoding technology. When a file in a user's Dropbox folder is changed, Dropbox only uploads the pieces of the file that are changed when synchronizing, when possible. 

Dropbox uses Amazon's S3 storage system to store the files; though Houston has started that Dropbox may switch to a different storage provider at some point in the future. It also uses SSL transfers for synchronization and stores the data via AES-256 encryption, though this is done with Dropbox's own encryption keys, and not the users'. 

Dropbox also provides a technology called LANSync, which allows computers on a local area network to securely download files locally from each other instead of always hitting the central servers. LANSync was developed by Dropbox Engineer Paul Bohm.