Duplication from Disk to tape

Hi,

could you please explain for me some points in this picture ? :

I would like to know if the duplication circled in red will start only after 28 days from the date of the first duplication? or as soon as the first duplication terminates, so immediately begin Netbackup duplication to tape which will have as retention of 1 year?

Backup to disk = DataDomain the (Site A).    
    Duplication = disk DataDomain on a mobile website (Site B).
        Duplucation= Tape duplication Site B.

thank you in advance for your return.