I have built a PC for a friend with the ASUS P8Z77-V LX in it, and it reaches 4.6GHz easily. It's a great board for 80£, yeah.
This is a nice guide for SSD's.
Um, with a reliable SSD (samsung is reliable, so good choice) it shouldn't really fail or crash or anything. The way I have my windows set up is have programs installed to C:, but move all the windows 7 libraries off to my 2TB storage drive, it's detailed somewhere in that SSD guide above. That way I don't lose any data if I do need to reformat, because all my save directories for the programs are usually on another HDD. It's a nice "modular" approach so there's nothing hinging on the operating system being perfect. If you want to be safe, however, a small partition would suffice for backups.
You wouldn't need any special software, you can go to Control Panel > System and security > Backup, then press Create system image on the left and follow instructions. It'll ask where you want to save it etc.