gitlab-ci backups conflict with gitlab-rails?

gitlab preinstall: Backing up GitLab SQL database (excluding Git repositories, uploads)
Dumping database ... 
rake aborted!
Errno::EACCES: Permission denied @ dir_s_mkdir - /var/opt/gitlab/backups/db
/opt/gitlab/embedded/service/gitlab-rails/lib/backup/database.rb:10:in `initialize'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/backup.rake:64:in `new'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/backup.rake:64:in `block (4 levels) in <top (required)>'
/opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/backup.rake:11:in `block (3 levels) in <top (required)>'
Tasks: TOP => gitlab:backup:db:create
<snip>
jacobvosmaer@ubuntu1404-test:~$ sudo ls -al ~git/backups
total 88
drwx------  2 gitlab-ci root  4096 May 18 11:55 .
drwxr-xr-x 13 root      root  4096 May 18 11:59 ..
-rw-------  1 git       git  81920 May 18 11:55 1431942941_gitlab_backup.tar

I suspect this problem is more likely to happen the other way around, with git owning /var/opt/gitlab/backups getting in the way of gitlab-ci-rake backup:create.

cc @marin