An extra hard drive with all current shoots & documents like model releases are simply a must! Cloud back works for most people but not for high volume shooters with terabytes or gigabytes of data. We tried an Cloud service once, after backing up 1 terabyte of data that took weeks and at the same time shooting stock the Cloud would never catch up.
It’s so simple to copy all your data to a extra hard drive & keep it at your friends or relative’s house. Easy to get too & it does not cost any monthly service, simple.
Recently we had a major fire at our home studio – please do not let this happen to you! And yes we had an off site backup!