remote creating backup-file

I have idea about remote creating backups. but I find one problem..
For example, a create group:

 /user group add name=backup policy=ssh,write,ftp

and user:

/user add name=backuper group=backup address=192.168.99.99

so, with this configuration that user can login from 192.168.99.99 ip-address without password (yes, i know about ssh-keygen, but question not about this).
And now I try

[mef@phobos ~]$ ssh backuper@host system backup save
failure: std failure: not allowed (9)

When my trouble? (into DNA? :wink:

how about just making a script that does backups every now and then?

hmmm.. Now I doing all, that write on http://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login), but again

$ ssh -l backuper -i id_dsa 10.0.0.1 "/system backup save"
failure: std failure: not allowed (9)

on 2.9.50 and 2.9.49.

No, I mean: http://wiki.mikrotik.com/wiki/Scripts

/user group add name=backup policy=ssh,read,write,test

The group must have the permission test