Upgrading to Yosemite but keep Mavericks

[krawfo]

I have a mid-2011 iMac with an SSD running Mavericks and I want to upgrade to Yosemite. Is there a way to keep my Mavericks install and revert back to it if I want?
Thanks.

 

[tywebb13]

Do a time machine backup. You may restore the mavericks backup later if need be.

Also consider dual booting.

I dual boot mavericks and yosemite beta on a 2014 rmbp and it works pretty good.

 

[krawfo]

Thanks for the reply Ty. I think I'll try it on a flash drive first.