This is the method I have been using for a long time to update Nextcloud AIO:
Link to the procedure
Today I updated from 11.7.0 → 11.8.0 using the same approach on three different servers, and everything went smoothly without any issues.
It’s important to keep in mind that when a new release comes out, the source server is often overloaded. This means that pulling the Docker images that are part of the AIO package can take considerably longer. Another factor is, of course, the internet connection speed of the server itself.
Examples from my case:
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Server 1 – update took about 20 minutes
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Servers 2 and 3 – updates took almost 50 minutes