I don't understand how you could think this. It's not merely the fact that it's incorrect I don't understand the line of logic that would lead to the conclusion that zfs requires any more sophisticated setup or ecc to function.

Furthermore backups and raid may be related but they are pretty orthogonal. Having a reasonable strategy to ensure performance integrity and reliability isn't obviated by having a good backup strategy.

If you have to restore from backup aren't you going to lose some amount of data even if it's only the last hour -> day.