Default partitions taking up large amount of disk space

While investigating in Disk Management after having my Yoga 11s laptop for a few months, I noticed a bunch of partitions that are taking up a large portion of space on my computer. Which brought up a bunch of questions (related to the screenshot below):
What are the EFI System Partition and OEM Partitions?
Does the recovery partition work with that OneKey Recovery?
What does OneKey actually supposed to back up? Both the core OS files and all of the personal files/data?
Why are there two recovery partitions listed?
If the other 4 partitions are needed/used why are they all 100% free space.
Should I be storing personal files on the D: primary partition or C: partition?
The allocation of file space doesn't seem to line up with Lenovo's description here (which also mentions only 3 partitions, not 6): http://download.lenovo.com/express/HT062547.html
I just purchased a 2TB external drive and planned to partition it into two 1TB partitions and use one for backup and one for storage. In this case, do I need such a large recovery parition, or any at all on my computer?
I had planned on using the Windows 8.1 native File History for backups on the external. OneKey seems to be more of a manual backup process, but I'm trying to figure out the best why to backup both my own personal files and the system files themselves. What's the best why to set that up?
See screenshot:
Thank you for the help!
Kevin

Thanks, I also found this article after some digging that explains the default partitions: http://www.lionhack.com/2013/12/25/lenovo-yoga-2-pro-partitions/
What's the reasoning behind Lenovo creating the separate C and D drives?

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Default partitions taking up large amount of disk space

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