HT201232 Is it possible to convert to Mavericks from Yosemite without a Mavericks backup?

I have a 2011 MacBook Pro and recently downloaded Yosemite. Turns out this was a horrible idea and my computer cannot handle the new software properly. I want to revert back to Mavericks, which was running wonderfully with few issues. I have not done a backup, and just ordered an external hard drive to use Time Machine with. I was wondering if it is possible for me to revert to Mavericks if I only have backups of the current Yosemite files/settings. I am not worried about keeping apps and their data (the most important stuff is in iCloud) but am more focused on my files, which I know I can back up to the external hard drive. I want to know if I can actually revert to Mavericks without killing my computer. I'm a recent college grad and don't have a spare $2500 laying around to spend on a new computer, which would be the ideal fix (it's been slow for a while anyways). Help please!

If you have no TM backup with Mavericks but you updated to Mavericks from say Mountain Lion then go to the app store under purchases and see if it will show Mavericks.  You may be able to download and install.  Be sure to save your files first. You could do an internet recovery (command-option-R) boot and it will install what came with your Mac (e.g. ML) then you can then update to Mavericks from the your purchases it it shows up there.

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