How to Backup your HD and Reinstall Lion

Hello to all,
I'm a Student of Informatic Engineering studiying at UCAB in Venezuela.
I have a Macbook Pro 13" late 2011 and needed of windows and ubuntu because some projects at University needed to be developed in those OS. I did the Bootcamp to add Windows to my MacBook Pro, and did an extra partition to the Macintosh HD to install the Ubuntu. All Sucess and finished the semester. Now i dont need these OS no more because i won an Acer and now i have Windows and Ubuntu in that laptop so i want my Mac only with OSX. Besides now the OSX is startint to act funny, so i think its about the triple partition (and i dont like my apps in OSX closing for no reason, and the system is getting a bit slow).
So, my question is:
1.- How do i Backup my Macintosh HD so i dont lose all my installed apps and data.
2.- Can i use Time Machine on any External Hard Drive?
3.- How do i clear all my hd so its like brand new, and Reinstall Lion (because when i bought the Mac it didnt came with an OS CD)
Thanks for any help you may bring me..
I'm Sorry for any misspelled word, English is not my main Language.
MacBook Pro 13" (Late 2011)
Specs:
Processor: Intel Core i7 2.8Ghz
Ram: 16GB 1333 Mhz DDR3
HD: 750 GB (Macintosh HD: 550 GB, Bootcamp: 160GB, Ubuntu: 40GB)
Graphics: Intel HD 3000

1.- How do i Backup my Macintosh HD so i dont lose all my installed apps and data.
2.- Can i use Time Machine on any External Hard Drive?
3.- How do i clear all my hd so its like brand new, and Reinstall Lion (because when i bought the Mac it didnt came with an OS CD)
1. Use Time Machine - it's on your Mac.
2. Yes - if the external has enough space.
3. After you back up, use the steps described in this Macworld article to make a clean install of OS X. Basically you reboot while holding down the command and R keys and proceed from there.
http://www.macworld.com/article/1167870/hands_on_with_mountain_lions_os_x_recove ry_and_internet_recovery.html

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