Hello Friends,
I’ve been reading about self-hosting Nextcloud on a Raspberry Pi and I wanted to know if it’s possible to install Nextcloud Hub 21 on an existing Raspberry Pi 4 running Retropie OS?
Hope you can help 
as retropi is raspbian based, id suggest going with nextcloudpi using the debian curl installer from here:
https://ownyourbits.com/nextcloudpi/
Dont forget to backup your sdcard before start and disconnect all external drives beforehand
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Many thanks for the suggestion @FadeFx 
Edit:
Have I understood correctly that Nextcloudpi is a full OS image, so I won’t be able to install it inside an existing Retropi preconfigured image?
well if you’d burn the available image to your sd-card it won’t work. but curl-ing it with that script?
curl -sSL https://raw.githubusercontent.com/nextcloud/nextcloudpi/master/install.sh | bash that shouldn’t overwrite your existing installation. except for maybe re-configuring some files to the needs of NC.
So the @FadeFx suggested to backup your sd-card to be able to get back to this backup in case of unsolvable problems.
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Let us know how it went 
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Will do 
Do you know if NextCloudPi is already upgraded to NC version 21?
Based on their GitHub page Readme, it seems like it’s still running on version 20.
Current version is still 20.0.8, as soon as 21.0.2 will be out, ncp will update as well. Thats another advantage, you get automatic curated updates that just work…
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Thanks.
Is there a website that shows the development history and roadmap for NextCloudPi, with info on changes to the stable and beta versions?
There is only this: