This is determined by the amount of water that you want to be pumped out of your basement. The best way to keep a sump pump in working order is to make sure that it is properly installed. The main purpose of a battery backup sump pump is to provide extra protection against water damage. This may be due to a clog or an overheating issue. You may even need to lubricate the bearings from time to time. A sump pump works by collecting water from your foundation and then moving it away from your property. To make sure your sump pump lasts as long as possible, it's best to perform regular maintenance.