update: git backup and restore documentation improved.

know-how/git-commands.md

@@ -91,20 +91,28 @@ Add executable flag on Windows:
 git update-index --chmod=+x git_mirror.sh
 ```
 
-Check the remote branch of a cloned repository and change it:
+Backup a repository from a source with all branches and tags.
 
 ```bash
+# fresh clone
+git clone --mirror <source-repo-url>
+
+# existing local clone update
+git fetch --all --tags --prune
+
+#Optional: zip it
+tar czf repo-backup.git.tar.gz repo.git
+```
+
+Restore a repository to a new destination with all branches and tags.
+
+```bash
+cd repo.git
+git remote -v
+git remote set-url origin <new-repo-url>
 git remote -v
 
-git remote set-url origin xwr@vs-ssh.visualstudio.com:v3/xwr/jambor.pro/app-docker-compose
+git push --mirror
-
-git remote -v
-
-for branch in $(git branch -r | grep -v '\->'); do
-  git checkout ${branch#origin/}
-  git push -u origin HEAD
-  git push --tags origin
-done
 ```
 
 Renaming branches:
@@ -122,3 +130,5 @@ git branch -m main wikiMaster
 # Push
 git push origin HEAD
 ```
+
+