@vordenken I'm preparing to rethink things but, currently:
1. Mirror non-blacklisted stuff in my /home to my four other drives (one external, only two of the same age and model) nightly using rdiff-backup with a two-week retention window
2. Mirror all of four drives to the fifth (a 6TB WD Red) nightly using rsync (rdiff-backup can't expire just some large files early)
3. Put my creations on GitHub (public) or BitBucket (private) ASAP
4. Manual DVD+R backups (with dvdisaster) for bulk stuff