>>jedber+2G
This is still a pretty common misconception (and one that I held until recently when looking at Redis configuration options again), but Redis does have durable operating modes to reload the datastore after going offline (which do significantly trade off speed for durability). If your task queue requires a high enough volume of workload that running Redis in a durable fashion is insufficient, then it's probably time to think about a different queuing system than WakaQ.