I was taking taking time machine backup on a network drive in a sparsebundle image. In order to use another usb HDD (exfat) to take backup I ran the commands explained here: http://hints.macworld.com/article.php?story=20140415132734925
Now the previous backup destination is deassociated with the Time Machine and when I appended this (network) destination again using follwoing command it starts backing up from the scratch (first backup)
sudo tmutil setdestination -a '/Volumes/MacBook-Backup/'
Can anyone tell me how do I reassociate the network sparsebundle the the my Mac as it has latest backup.