Time Machine doesn't have backups of Documents folder
Hello. I recently purchased a Toshiba External Hard Drive to back up my Macbook Air with so that I could reinstall OSX and solve some issues my laptop has been having. I used Time Machine to back up all of my stuff to the external hard drive, which was called TOSHIBA EXT.
However, after the first backup finished, I noticed that my entire Documents folder was not in there. I'd go through this file path:
Finder --> under Devices is TOSHIBA EXT --> Backups.backupdb --> [My Name]'s Macbook Air --> lots of folders with names that are dates (like "2015-08-02-045837") and in each --> Macintosh HD --> Applications, Library, System, User Information, Users, opt
Nowhere in any of these folders can I find my Documents folder, wherein I keep almost all my important saved work. How can I get to those documents (mostly .doc's) to ensure that they are backed up? If I reinstall all my things without those documents I'll be completely screwed.
I think it has something to do with not being able to get to the Documents folder from Macintosh HD, but I don't know
MacBook Air, OS X Yosemite (10.10.4)