Understanding file backup settings

I look for advise please for the settings. I would like to set file backup but after trying every possibility i can not get it working. Also i do not understand what is the difference between setting up the default directory to backup in the server settings and the client settings. I am so sorry but i can not figure it out from the documentation.
thank you

Sorry i ve gotten it working, it was a syntax error in path. However what i still do not understand what is difference in the server settings if server/file backups and client/file backups