If you use Apple's Time Machine to back-up your Mac and you notice fsck running (and you will notice because it uses up about 50% of available CPU when it runs) don't kill it. Even if it runs for 24+ hours, crippling your machines performance the whole time, don't kill it. Even if you have a SSD based drive that manages file-system integrity at a lower level, and aren't completely sure it's needed, don't kill it.
If you do get impatient, for example watching an exciting finish of a tour stage and the video re-buffers constantly, and you stupidly kill it, you will immediately get a message say your time machine backup agent explaining that all the existing backups are now inconsistent and you will need to start a completely new 100+ Gb backup set from scratch. Lesson Learned.
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