I am in the middle of a very long initial backup. I wanted to pause and resume the backup without losing the first half of the backup. Mavericks Time Machine offers a 'Skip This Backup' option. No Pause option. No Stop option. And no Apple documentation or Help. Apple Help Center tells me to hit 'Stop'. Apparently no one at Apple thought to update the documenation with Mavericks eight months ago.
Yes, I am having this same issue.
Now there is even a specific support page for El Capitan and it still has this issue:
OS X El Capitan: Start, pause, and resume a Time Machine backup
Pause a backup: Click the Time Machine icon in the menu bar, then choose Stop Backing Up.
Resume a backup: Click the Time Machine icon in the menu bar, then choose Back Up Now.
There is only Skip This Backup.
Was the advice to hit Stop meant to say that it would do essentially a pause - when you come back and run again it would take advantage of what had been done, or were they saying there is no pause function and all you can do is quit and start over?