How To: Tell the Difference Between a Backup and a Backflow Backups A backup occurs when waste or debris has obstructed a home’s plumbing system or lateral, resulting in clogged or slow-moving drains or toilets. They will normally happen on the homeowner’s property and, unfortunately, the expense and responsibility for repair lies with the homeowner. […] The post Backup and Backflow in Los Angeles and Phoenix appeared first on Twin Home Experts.