On the 1and1 business accounts you can now use Git via SSH. Here is how...
Setup your master FTP password (which will be used for SSH).
SSH into your 1and1 account with (assuming example.com is on this account):
ssh username@example.com
mkdir repositories
cd repositories
git init --bare my_repo.git
Now on your local machine you can clone this repository with:
git clone ssh://username@example.com/~/repositories/my_repo.git
Or to add 1and1 as a remote location for an existing repository do:
git remote add origin ssh://username@example.com/~/repositories/my_repo.git
Enjoy...
