Yeah, we consider Zerto and other continuous replication DR solutions like Azure Site Recovery, VMware Site Recovery Manager, etc. to be the current gold standard for protecting self-hosted Laserfiche systems. We use such a solution ourselves.

Hopefully your Zerto logs can help provide some indications of why the failback took much longer than expected. I'm guessing the failback delta for Laserfiche wasn't particularly large. Perhaps there were network bottlenecks over ISP circuits as many organizations were carrying out DR operations? Difficult to speculate on without logging/monitoring data.