Gitリポジトリの中身を、ブランチとタグも含めて別リポジトリにコピーする ref: https://qiita.com/1000k/items/2a5dcda5fd41f38fd5d5

file0.txt

git clone https://bitbucket.org/1000k/FOOBAR.git
cd FOOBAR/

file1.txt

git branch -r | grep -v "\->" | grep -v master | while read remote; do git branch --track "${remote#origin/}" "$remote"; done
git fetch --all
git pull --all

file2.txt

git remote set-url origin https://github.com/1000k/FOOBAR.git
git push --all origin
git push --tags