There are some functions which will occupy storage
loading apps to the loacal storage (different version of apps...)
install apps with different versions.
every install creates internal snapshots (max 3) for jumping back
backup create some temp data (still a bug at the version 1.10, that this temp data will not cleared if you have a backup error....)
....
If you have uninstall apps at the next boot up the control makes a self storage cleaning (more or less succesful at this version) which will free some storage (e.g. deleting the internal snapshots, ...). Thats the reason why you see a went up of free storage after a while....
To start with a "virgin" system with the next release (V1.12 - RM 21.11) you have the possibility to install a system image.
Hope this explanation will clear some questionmarks. 🙂
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