Question External hard drive capacity very low

[888qqq]

I use a Western Digital My Passport Ultra 1 TB portable external USB 3.0 hard drive with Auto Backup to backup my data. My pc is a Lenovo H500S with a Samsung EVO 1 TB SSD, and I use Windows 8.1 64 bit.

My internal 1 TB hard drive shows 672 Gb of free space, but my internal WD 1 TB hard drive that I use for backup shows only 300 Gb of free space. On my external drive Other Backups is 116 GB, and Additional Files is 465 GB. I have the number of backup versions to keep for each file set at 5, but in Retrieve in my external drive it shows very few files with more than a couple versions saved. Why are Other Backups and Additional Files so big? Thanks for any replies.

 

[888qqq]

These are the folders on my external hard drive and their size in parentheses:
1)File History(263GB)>Jake567(263GB)>LENOVO-PC((263GB)>Configuration(263GB)>Catalog1.edb, Catalog2.edb,Config1.xml,Config2.xml

>DATA>(263GB)>$OF63.0GB)>hundreds of numbered folders

>C(200GB)>USERS(200GB)>Jake567((200GB)>ten of my folders



2)Temp(0GB)



3)WD SmartWa.swstor(0)>LENOVO-PC(0)>Volume.c5c1.....(0)>FRST(0)



4)WDSmartware>swstor(425GB)>LENOVO-PC(425GB)>Volume.052e5a....(71.6GB)>four folders and four documents

> Volume>c5c1e0......(353GB)>same folders and documents as in Volume.052e5a...plus a few more

> .comwdc.metadata.xml(1KB)

There is a lot of duplicating of files and folders on my external hard drive. Can you tell from this list which folders I can safely delete? Why is my external hd duplicating so many things? Thanks.