You are very very talented!
I can't believe how much personality you have in these pictures -- very impressive.
I have seen countless attempts at character animations by those just starting out with pixels, and most require a lot of work, but your box sneak animation is basically perfect.
Your two mock-ups would easily catch my eye, even on the most busy of 'real' gaming sites. You have definitely infused them with a sense of unique style, and implicit story (I wanna know what happens next in the first one!).
Losing data can be devastating -- I don't back-up every single day to a thumb-drive just because it's a good idea, but because of unfortunate experiences. I like Fake_Kraid's advice, which I think you can apply because you are justified in some cockiness, due to your talent.
So, anyway, if you would like some encouragement to help salve the hurt and replace the loss, then I would say please keep going -- if you are already this good then by time you get to be an ol' codger like me you have a good chance at being one of the brightest stars in the firmament.
Good luck, Andrio, and a hearty welcome to Pixelation!