If you start on a free plan but then ultimately switch to another provider do you have any idea of how hard it would be to export and import all your tasks, files, etc?
I have moved twice now. First from my raspberry pi to cloud and the second time between cloud providers.
There might be other ways but you can share folders between Nextcloud instances.
I have shared my whole nextcloud from the old one to a folder in the new one. Then in the new instance you copy folders from the shared drive to your new instance. For ~300-400 GB in takes a moment and I do some spot checks, but after half a day it's done. And you don't actually do things, you just wait that a folder copy finishes, check and then start the new one.
There might be more automated ways, but this worked for me.
Files are files so you can download them to your computer and upload them to the new provider. Unfortunately I am not aware of any direct provider-to-provider sync.
Application data depends on the app. For example, Notes [0] save your notes as Markdown files so you can move them (along with your files) wherever you want. However, News [1] don't and don't have export/import features at the moment either [2].
Nextcloud as a file storage solution and a non-collaborative office suite is great, but I cannot recommend its apps the same way. They are very convenient to install, but the quality varies a lot in my opinion so evaluate before you adopt.
