Upgrading from gitlab-ce 8.5.0 to 10.6.4-

currently running GitLab Community Edition 8.5.0
trying to upgrade to to most recent current version of gitlab gitlab-10.6.4-ce via rpm.
I am having a couple of issues, mainly the postgresql database is a different version which needs several changes. I would be willing to reinstall redhat with new install of redhat 7, but I also read that the gitlab backup format changed. will gitlab 10 still understand the older backup or is there a method to convert the old backup to the new backup format.

For the RPM world, @astrachan has the answer here:

For the Debian/Ubuntu world, I posted an update strategy here:

Tell us if this works for you.