Hey Reise, this is my backup strategy. In my main computer I have 2 hard drives. The C drive contains my operating system and all the various programs I have installed over the years. My D drive contains various files - MP3, recorded TV programs, photos, Word Doc's etc. About once a month, I will use Acronis True Image Home to make an image of my C drive and store it on to my D drive. I do this mainly to recover in the event the C drive fails, or if I get a nasty virus and want to recover back to a point in time before the computer was infected. I keep the last 2 or 3 backups, erasing the oldest one each time.
For my D drive, I just copy and paste the directories that are important to another computer on my home network (including the Acronis backup images) and store on the storage drive of that computer. Not all of the files are that important (like the last years worth of NFL's Houston Texan's games), so I don't copy them at all. If I lose them, no big deal, I will be erasing them anyway when the next season begins.
For the most important files, I also copy them over to an external WD My Passport drive which is then disconnected from the computer. The main thing about backups is to have a strategy, follow that strategy, and document what is stored where.