Subsequent upgrades

Hi, my goal is to upgrade from 12.0-RELEASE to 13.0-RELEASE According to my understanding, it is not possible to jump directly to latest version.
Correct?
Let's say I just upgraded from 12.0-RELEASE to 12.1-RELEASE. In order to save space for the next upgrades (12.1-RELEASE -> 12.2-RELEASE, 12.2-RELEASE -> 13.0-RELEASE), there is anything I can do to save space?
My guess

pkg clean
rm -rf /var/db/freebsd-update/*


?
What do you think?
Thank you!
 
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