I find overly complex encryption schemes, self invented worst of it, a quite sure road to loss and desaster later, unless you perfectly document everything. How do you protect your documentation then? Never rely on your memory alone, it will fail you in some future (I speak from own experience).
Some wallet data are handwritten on papers and stored with multiple copies (5-6 copies); remainder wallet data is stored with electronic format, which are stored on 3-4 encrypted USB drives and 2-3 emails. There are unencrypted files in the two fingerprint U disks, but the corresponding handwritten files are not stored in my home. The encryption file production is completed on offline isolated computers.