My only concern about DropBox is how safe it is? I mean so that other people won't get an access to my data stored there? Tahnks, Phrexeus. SyncToy looks pretty interesting, I'll definitely give it a try. Thank you for all your suggestions :)
I have SyncToy auto backup every day to my backup hard drive. Dropbox is a good idea, but not for the whole project folder because of the 2GB limit (my projects are often into the GBs with all the .psd textures and high poly exports). Very nice gun, glad you didn't totally lose it.