I have two git repositories on different PCs. I have some local branches on every one of them. I don`t want to send this branches to remote server, just keep them local. How can I synchronize then without using a web? Can I just zip repository on one PC and move to another? Is that safe? Maybe I can export somehow newest changes from every branch?
Direct copy of a repository to the other file system is an alternative to bare clone or to bundle. After copying you can set the copied repo up directly as a local remote - unintuitive as local remote may seem - to fetch and merge into the first repository.
I.e. to merge repo2 from a second computer into ~/repo1, first copy repo2 to the repo1 file system at ~/repo2 (memory stick, network copy, etc.) and then you can use the answer to Git pulling changes between two local repositories:
~/repo1 $ git remote add repo2 ~/repo2
~/repo1 $ git fetch repo2
~/repo1 $ git merge repo2/foo
This works because as the wikipedia article on git says: "A Git repository — data and metadata — is completely contained within its directory, so a normal system-level copy (or rename, or delete) of an entire Git repository is a safe operation. The resulting copy is both independent of and unaware of the original."