I have about 5 memory banks of 1 terabyte or 500 GB. Back up of years work. But its chaotic and full of duplicates. What is the easiest way to back it all on to the cloud, in the process eradicating duplicates and then enabling me order and rationalize the whole lot?

Thanks in advance

Are you looking for a cloud solution or a way to organize.

 

If you only have 4-6TB of material, then buy on HDD and 500B dock, Arrange and find dupe files you can use dupeguru. This also caught my eye today, https://github.com/qarmin/czkawka

For cloud solution, I was looking to store some data last month, backblaze was suggested - it looks pretty competitive. 
 

A few years ago I bought a Synology NAS, was one of my best purchases, small drives are just nightmares to search and organize data. Having a scalable storage system is so much easier to organize and visualize, it saves so much time and stress.