For 6GB of data, I would keep it simple:
I agree, it sounds like haha's main concern is ~ 6GB of files. So start simple, get a solid plan for that, then move on to getting a back up of settings, etc.
Fortunately, backing up ~ 6GB of data is simple these days.
- Backup to a hard drive/USB drive as stage 1
Since it is only 6GB, I'd go with a USB flash (thumb) drive. A 16GB is ~ $15 now, get three of them so you can rotate, have one off-site, and redundancy. You could keep two copies of a 6GB sub-folder on each, to keep an archive, in case you accidentally deleted a needed file (more on this below).
Anyhow, KISS at first, just copy that folder to the thumb drives. EZ.
- Burn to DVD as stage 2, and store in bank safe deposit box.
- Back up to the "cloud" (i.e. the internet) via one of the services as stage 3
The frequency of backing up with depend on how often that 6GB of data changes. The more frequent the changes, along with the difficultly of recreating those changes to a previous backup, the more frequently you need to backup.
I'm not a big fan of DVDs. It takes some time to burn, I don't trust them long term, and cost will add up if the data changes frequently.
Cloud - pros/cons, others covered that.
Now, to get just a bit more advanced than a straight copy, I use an open-source program that is available for all major OS - GRSync.
http://grsync-win.sourceforge.net/
There is a slight learning curve to this, but what it does very well is 'incremental' updates. Once you back up the whole 6GB, you can run GRSync and it can be set to ADD any changed/new files to your backup. This is very fast, as only changes/updates are copied. And it can be set to not delete the older versions (not sure about that if you use the same file name - that might get over-written, I need to check) - but for important files, I always add a suffix, A001, A002, etc to updates.
edit/add: Note that GRSync does a simple copy, but in a smart way. You don't need the software to recover the backup or anything - it is stored just as if you did a straight file copy. That is important to me, I don't want to worry about special software working properly to recover something, and I can always do a quick check of the copy by just poking around the drive.
You could do this with USB hard drives, but those will cost more when you want 2-3 of them, and probably have more storage than you need for this, and are physically larger. You might want one hard drive for settings, etc - depends how much that is.
-ERD50