I found the best and simplest method here, just as @kumarahul posted, works like a charm for me, it will push all the tags and branches from origin to the new remote:
git remote add newremote new-remote-url
git push newremote --tags refs/remotes/origin/*:refs/heads/*
I used 'git push --all -u newremote', but it only push the checkouted branches to the newremote.
Git: Push All Branches to a New Remote
by Keith Dechant , Software Architect
Here's a scenario some of you might have encountered with your Git
repositories. You have a working copy of a Git repo, say from an old
server. But you only have the working copy, and the origin is not
accessible. So you can't just fork it. But you want to push the whole
repo and all the branch history to your new remote.
This is possible if your working copy contains the tracking branches
from the old remote (origin/branch1, origin/branch1, etc.). If you do,
you have the entire repo and history.
However, in my case there were dozens of branches, and some or all of
them I had never checked out locally. Pushing them all seemed like a
heavy lift. So, how to proceed?
I identified two options:
Option 1: Checkout every branch and push I could do this, and I could
even write a Bash script to help. However, doing this would change my
working files with each checkout, and would create a local branch for
each of the remote tracking branches. This would be slow with a large
repo.
Option 2: Push without changing your working copy There is a second
alternative, which doesn't require a checkout of each branch, doesn't
create extraneous branches in the working copy, and doesn't even
modify the files in the working copy.
If your old, no-longer-active remote is called "oldremote" and your
new remote is called "newremote", you can push just the remote
tracking branches with this command:
git push newremote refs/remotes/oldremote/*:refs/heads/*
In some
cases, it's also possible to push just a subset of the branches. If
the branch names are namespaced with a slash (e.g.,
oldremote/features/branch3, oldremote/features/branch4, etc.), you can
push only the remote tracking branches with names beginning with
"oldremote/features":
git push newremote refs/remotes/oldremote/features/*:refs/heads/features/*
Whether you
push all the branches or just some of them, Git will perform the
entire operation without creating any new local branches, and without
making changes to your working files. Every tracking branch that
matches your pattern will be pushed to the new remote.
For more information on the topic, check out this thread on Stack
Overflow.
Date posted: October 9, 2017
git push -u --branches