boot environment and /var/db/etcupdate ?

Hi,

I'm running the super duper boot environment using ZFS. [1]

I have /var and /usr/local as separate datasets. These do not change when I upgrade the OS and that keeps the backups a lot smaller as the backup sees a new BE as a new dataset and fully zfs sends all the data again.

But when I rollback /var/db/etcupdate is not in sync with / anymore.
And /var/db/ports and /var/db/pkg should be kept in sync with /usr/local. But I do not need to rollback these if I need to go back to the previous BE.

Do people have a nice solution for this?

Should I mv and symlink /var/db/etcupdate to somewhere in the BE?

Regards,
Ronald.

[1] https://wiki.freebsd.org/BootEnvironments