IELTS

No, your IELTS individual band score is not good. You need at least 6 in each band. To get into a university you should aim for 7 band individual and 7.5 overall (due to competition).

IELTS is compulsory for almost all students going to foreign countries. You can appear either for IELTS or TOEFL.

Hi,
Yes, you have a decent score in IELTS. You can apply for admission.

A student visa for Canada would need you to score at least 5.5 in each of the four segments with an overall minimum score of 6.0 and above for undergraduate courses. For graduate courses, the same goes up to 6.5 and above with a minimum of 6.0 score in each of the four tests of IELTS.

In order to apply and get admission, you have to fulfill all the eligibility criteria. Just having good IELTS score is not enough.

Yes, backlogs will greatly affect your chances. It is a huge negative reflection. First of all, you have to clear all the backs without which you will not be eligible. Then also your CV matters the most, nevertheless it doesn't mean that all hopes are drowned.

https://studyabroad.shiksha.com/canada/ms-in-civil-engineering-colleges-ds
Use this link. Beneath the university names there's an option marked rate your chance, please do give that a try.

Both are very good, and least matter where you join. I recommend British Council.