Samba shared directory access for lftp

[acs]

Hi,

I have a zentyal 4.2 server and was planing to backup using lftp. I have created (using sudo via the command line) a crontab and basic backup script. the problem is my adm (that I use to log in via putty) account has no access to the /home/samba directory and as suck backs up everything in the home dir except for the shares!

How can I give my adm access to the folder without affecting the other users and existing ACL's?

[acs]

just to add, the file permissions showing from ls- l is;
drwxrwx---+  4 root             domain users 4096 Jan 29 09:47 samba

I see root has access so why can't I use it?