After losing 6 weeks of photographs when my computer’s hard disk failed last summer I got very serious about protecting my data.  As of today I have four copies of all my data.  It took 4 months of continuous uploading to transfer more than 100,000 images to Carbonite. The initial back up was painfully slow but incremental ones should occur with minimal delay. This is my primary offsite backup and contains all of my high resolution source files.  I have a local copy on my Time Machine server located in the basement.  I will use this archive for file restoration if needed since it is much faster than Carbonite. The problem with any local backup is that you are not protected from a fire, flood or lightning strike that impacts the entire home. For further redundancy, I use Google Photos to store medium resolution JPEGs and rely on its search function to locate photos quickly and access them from any browser in the world.  Finally, I have all my original photos stored on my desktop computer.