Redis Storage Requirements Vs SQL Server

question
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1

Is the amount of storage required for the Redis configuration the same as SQL Server?

We currently have a working Hangfire configuration using SQL Server. If we were to transition to Redis would the same amount of storage be required? If our database setup is using 100 GB, would we need to get the same size (or larger) Redis cache?

Also, wanted to note that the job table is using the majority of the data in our setup.

Thanks,
Dan