save transfer:using rsync

[Madan Kumar]

Hi all,
I need to know the details of "save transfer" command using rsync. What is the purpose of using this command. 
Can we save only the diffs of files using this command? Does it works on stand alone system? 
Please give me the syntax this command for stand alone system as i want to back up of one directory to another directory(these may be in different partition of hard disk). 


Your suggestions are important to me. 




Thanks
Regards
M Chauhan
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