In addition to your data that you want to access over the network, you need to provide disk space for:
The data in the above list that you need to be most concerned about are Virtual Machines as these may have very significant data volumes:
In most cases, we believe that the remaining areas above are usually not going to be worth estimating because:
1. In our experience they are typically relatively small compared to the network accessible data (unless you plan to use something extraordinary as an application); and
2. The TrueNAS operating system is only supported when on a separate disk from other data
3. TrueNAS and applications would benefit from being on an SSD - and if you are having to buy a separate disk anyway, why not use a (relatively small by comparison to your main data) SSD to host the operating system.
We will come back to this requirement when we start to consider what hardware we are going to use to meet these requirements.
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