I am on a limited traffic plan, so for me it is important to know in advance how much traffic will an update use (like ‘zypper up’ in openSUSE shows). Unfortunately, the default Qubes Update tool does not seem to show that info even when clicking “Details”.
In section “Command-line interface” of the docs How to update there is a warning which strongly recommends using the Qubes Update tool for security reasons. While still learning about Qubes OS, I am careful not to risk the security of the system, although those tools may probably give more info about what is to be downloaded.
So, what is the correct and secure way to update and still be able to see what and how much will be downloaded in advance?