Swapping a Premium Azure cache for a Balanced one frees $701 a month at B20

Subtract the two pay-as-you-go figures in the largest comparison and the B20 move frees $701 a month, or $8,412 over twelve months, which is the $8,410 Redis rounds to ^[3][1]. At the bottom of the list, Basic C2 to a non-HA B3 frees $18.25 a month, about $219 a year ^[5][2].

Redis gives one checklist for the move whatever the size: client, network, Terraform and automation changes, testing, temporary parallel environments, data transfer, cutover, and rollback preparation ^[9]. Microsoft says most client applications need nothing beyond new connection settings and clustering configuration, though some command patterns require attention ^[10]. Whatever that work costs, it takes about 38 times as long to pay back in the Basic C2 case as in the B20 case ^[3].

The same price snapshot contains a competing option. Two-node B20 costs $918 a month pay-as-you-go and $597 with a one-year reservation, 35% less for the same service on the same tier, with no cutover ^[3][4][4].

The case inverts on one sizing decision. Load testing decides the sign of it: Redis puts a P1 workload that needs Compute Optimized X5 at $424.86 a month against $404.42 today, about 5% more, roughly $245 a year added ^[7][6]. Redis advises matching the target's usable capacity to peak usage and growth, and testing throughput, latency and connections before choosing a size ^[11].

The rates are checkable. They come from the Azure Retail Prices API for East US 2, captured on September 13, 2026, at 730 hours a month and two high-availability nodes, and they exclude taxes, contract discounts, networking and migration costs ^[8]. The post is plain about where the money comes from: "The revised pricing structure produces these savings. You do not need to assume faster application performance or less engineering work to achieve them." ^[13] One line item sits outside the comparison. Azure Managed Redis includes its managed persistence disk, which can remove Premium's separate persistence-storage charge where the configuration supports it ^[15].

Redis reduces the decision to three numbers: what you pay today, the cost of the right AMR configuration, and the cost of migration ^[14]. A fourth one schedules it. Fixed migration cost divided by monthly delta gives months of payback, weighed against the remaining life of the workload. A P-tier cache carrying a four-figure monthly bill clears that comfortably. A development cache at $65.70 a month does not, and there the cheaper answer is to leave it running ^[5].