Gitlab V9.0.0 backup restoration to latest Gitlab Omnibus version

We have outdated 9.0.0 version of gitlab.

Although I have put some effort into seraching docs for upgrading, I find it tedious to upgrade it to the latest version now. At least I could not find “easy” steps to do so.

I’ve setup fresh Gitlab Omnibus installation, and now want to restore all repositories to the new Gitlab Omnibus.

From the docs I understand that backup restoration can be done only if I have same Gitlab versions installed.

How do you advize to proceed with project migration to new Gitlab instance?