why are you shrinking the DB which will cause the log to grow and index will be defragmented

so you have to do reindexing after that which will again grow the log file.

can you explain is log file backup is the one which is occupying 6 -10 MB as i coudnt get your explaination clearly sorry if it is my miss.

what is the DB size and what is log file size on that and log backup and backup stratergy details.