I'll check out snapraid, thanks.

The challenge is a "bit of a backup" is risky. There's no back up if it's only a single copy of something, or even a single copy of something.

3-2-1 backups are really in time teach everyone the lesson that you don't buy storage, you buy backups, some that are more quickly accessible than others.

The cost of "maximizing" space with the drives I have, for example, is relatively trivial and simpler, its in the hundreds of dollars now instead of thousands. The upside is huge.

Solely trusting third party services is risky, and locally holding your data can be relatively managed well.