It does help a bit. The changes you mention, are indeed the changes I mean. I've changed a standard view and a standard report. After reboot they both get back to original state. So there is no way of keeping the edited views and qweb reports on a reboot? I don't mind if they get reloaded on an update. But reboots have never reloaded this in Odoo 8.

@Michael the preffered way to do such modifications is through code by inheriting the existing modules and extending them. I'm going to assume you did the changes on your Odoo in the front-end, through the website? These changes are always cleared / reloaded when you'd do a database update, so not really a safe way to modify your system.

So no other options? I think this is really bad. Updates that have been done either in front or backend should at least last through reboots. I understand that it will be reset when I upgrade odoo to a newer version (because of incompatibility issues). In Odoo 8 and OpenERP 7 this was possible and would last.