Because of the considerable increase in disk space by the blockchain and apps, it is considered useful to be able to use a second disk to install all the apps that run on Umbrel. The main disk would be left with just the blockchain.
During installation we could choose another installation location.
Do you think it is possible and useful?
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Thanks for your post @Redin!
It is currently on the roadmap to try and add a feature to more easily migrate between storage devices 
Currently simultaneous use of two drives is not officially supported. You can indeed however specify an external drive during installation.
To do so just use this command:
curl -L https://umbrel.sh | bash -s -- --install-path path/to/external/drive
Replacing of course, "path/to/external/drive" with whatever the path is where you want to install
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