iPhoto to Lightroom problems

I am moving a lot of pictures off my iphoto iCloud because it is clogging up my Ipad.  I can not download the next update.  UGH!  

So I looked into Lightroom for organization and the cloud (is the lightroom cloud the same as the adobe cloud?) since I use Adobe Photoshop, illustrator and After Effects often.  I moved over what looked like about 740 photos.  If you look at the Lightroom cloud screen shot below you will see that it has 225 mbs on the cloud.  That may be about right.  But if you look at the next screen shot the Lightroom library records 126.7 mbs.  That seems too little.  

Same with the photos.library.phototslibrary which says there is 53.9 GB of photos in the library, but under storage, another screen shot, it says 45.85 gbs, AND on my icloud it says there is there are 65.2 GBs on the cloud.  Why are the numbers not adding up?  I want to make this switch and am nervous that I am doing something wrong.  

So at this point all the photos on Lightroom are not backed up to anywhere but the Lightroom cloud, right?  I need to get an external drive I guess.  And the photos on Apple’s iCloud are only on that cloud, correct.  I may add photos to the Amazon photos apps as a back up…..??