pi-imgtank/doc/samba_install.md

Install Samba as a Fileserver

To install and configure samba, run

sudo su -
cd pi-imgtank
tools/install-samba

Note that this is a very simple and insecure setup, since it allows read/write access to the backuped images for everyone without any password. If you need better security, change /etc/samba/smb.conf accordingly.

Please set 'guest account' to the owner of /data/images (normally pi).