Is there a storage or file count limit for Business plan hosting

Yes. Please refer to: After Upgrading from Next.js 14.0 to 14.2 NetlifyCacheHandler.get fails - #5 by hrishikesh

Yeah, that’s about right. We’re currently working on a central-caching primitive (so almost like a replacement for On Demand Builders but as a standard primitive instead of a proprietary feature) which could potentially change this in the future. But what you said is the currently true.