@mikecwest did a great job explaining everything above.Hi mate, I've just replied above about the CCC snapshots. Maybe you could take look at the screenshot. Its. huge amount of space!
I'm confused as to why I would need TM making constant snapshots, and CCC making snapshots too, and also why have them at all? They are stored on the same drive so if that fails they are all gone. But I'm backing up regularly to other drives with CCC and TM, so why isnt that enough? Is it just to save deleted files, or to restore to an earlier point in the last day or two? If so, I'm not sure its worth the space!
I'm a bit confused about what to do. thanks for everyones help, I feel I might be getting close to sorting it out!
They do snapshots to offload to external drives later. So, say I delete an important document because I don't think I need it - they "save" this temporarily so they can offload it to the external drive when I hook it up to an external drive. Also, this makes restoring that important document easy without needing my external drive there. It's a backup of a backup in a way.
I use both CCC and TM because my data is super important to me. I realize it's a bit redundant but you can't ever have too many backups. That and I have a 1TB SSD with only 180GB used so I don't mind the extra space used. I use CCC to delete large snapshots if I remove something large I don't need.
I've noticed that TM snapshots far more regularly than CCC does. But I'm no expert.
If I had a 256GB SSD or 128GB SSD, I'd only use one to snapshot and just use CCC to copy to an external drive without snapshots.