This has built up over time and files listed in /var/db/freebsd-update/files/ are small .gz files now totalling over 1.1GB going back to early last year along with all the install files. What should be done?
freebsd-update rollback. I frequently run freebsd-update fetch and before issuing this command I do rm -r /var/db/freebsd-update/*. It is only 10 characters more than typing 'freebsd-update clean', and I never felt the need to put this into a script. The important note is, that in years, I had no single issue, by cleaning said directory frequently.