These look like they are all Full Image Backups?
Viewing By Date Modified. Macrium Reflect suggests You should keep no more than 10 image files for C: and D: each for a year; which I think is overkill, IMO. Remember, you don't have to do a Full backup every time, you can add to the Full backup with an Incremental Backup, say daily or weekly, and a Full backup once a week or a month.
The latest date should be the one that you would restore. Macrium also suggest having more than one Backup drive to store your Backup images on rotating those disks every other backup, in case that disk fails.

 

Thanks, it was suposed to be set up to do a full once a week and incremental each day. I also noticed that it is doing backups for drive C(Op sys) and D(Data) and saving them in the same external folder.
I need to change the backups to store them in separate folders and I need to check the frequencies too. I only looked at one backup drive, it does back to another drive which constitutes a backup of the backup as it were. If I ever needed to use one I would choose whichever has the latest date and time.
I'll probably delete all the XML files and start from scratch again rather than editing them.

 

You also don't really need to Image your D: Data drive, unless you want to save space on the Destination Backup drive, you can just Copy and Paste. And it doesn't need to be backed up as often, unless you are saving new files to the Data drive.