Can I apply for Masters in Canada? I had 9 backlogs during my B.Tech and I completed before my final year.

You can apply, check the entry requirements before applying. The top universities will be very difficult as they have higher requirements and candidates with previous backlogs are not preferred. You must also take the IELTS or TOEFL. In case you take IELTS a score of 6.5 with no section less than 6