Usefull Commands:

Initialize git-annex repo:

git-annex init
   git-annex add ./files/

To initialize the remote repo push the git-annex branch:

git push origin git-annex

To sync only the symlinks and where each file is:

git-annex sync

Copy files to another remote:

git-annex copy ./files/* --to origin

and to fetch remote files run

git-annex copy ./files/* --from origin

If a remote was declared incompatible run this:

git config remote.origin.annex-ignore false

Unlock and Lock Files for editing

git-annex unlock path/to/file
   # Edit and save it
   git commit