I mentioned before that you could use the idea of data persistency to rebuild your data from total failure. There are two types. RDB and AOF.
RDB – persists a snapshot of your cache in a binary format. The snapshot is saved in an Azure Storage account. AOF – saves every write operation to a log. The log is saved at least once per second into an Azure Storage account.
This is quite an in-depth topic area and I suggest further reading to determine which one suits you: https://redis.io/topics/persistence#aof-disadvantages
To set this up you will see data persistence section within your Redis Cache