I don't recommend using hard drives for archival purposes, they're not rated for that. Have you considered LTO-4 tapes: the price per unit GB comparable and they are intended for archival storage. You could ship them to an offsite location or make two copies and send to two locations if you're paranoid. Setup is relatively cheap if you just buy a tape drive, somewhat more if you buy fancy software and a tape robot.

Software quality isn't a single thing, it emerges from a reasonable process. As a simple start, I'd recommend getting a few copies of "The Software Project Survival Guide" It's a little old, but still relevant. (http://www.microsoft.com/MSPress/books/1332.aspx)
And going through the checklist in there.
Do you have a source control system? do you have a bug tracking system? do you have a change management board?
It provides a means of incrementally improving your software process in a way that can be understood by management and will show good results. It won't fix everything immediately, that'll be a long struggle to change the culture, but it gives you a roadmap to make things incrementally better every day.