iPad is not turning on due to cancelling upgrading

I upgraded my ipad 2 from ios 6 to ios 8. But, I cancelled upgrading it by turning it off because I thought that my files aren't backed up to a pc. I used ipad alone to upgrade it. When I turned on my ipad there's an image of usb connector and iTunes icon signifying to connect it to itunes. I have a question, would all my files such as photos, paid apps, and memorable videos still restored in my ipad?