Looks like I’ve evolved a hybrid system:
- Proper backup / synch tool: SuperFlexibleFileSynchronizer (abbrev to “SuperFlex”).
- Procedural with lower-level tools: File drag-copy combined with MD5Summer.
The idea is that normally I would use SuperFlex, but for occasions where I already have manually-created (supposed) mirrors, I can retrospectively check consistency at content (not just datetime and size) level. Have yet to experiment with SuperFlex to see if it can verify existing copies of files (as opposed to copies that it is making).