It is a common knowledge that winters in Toronto are very cold, top it up with closeness to the lake and you have perfect conditions for basement flooding. This is the last thing you want to deal with during the cold season. Decrease of temperature and icing of the water in soil can cause cracks and leaks letting the moisture to your basement. As a result you could have mildew, mold and damage to the staff you store in the basement.
If you want that your basement should always stay dry, it is better to prevent the sump pump problems than to solve them intensively when they have already appeared.
You can pay much more for the repair works if your sump pump goes out of order. You will need to fix it immediately because even a little water can result in huge damage.