Keep in mind that it always can happen that software gets corrupted.
Just one bit that is placed wrong can already cause many problems.
With todays systems it can already happen if there is e.g. a power shortage of less than a nanosecond.
We as humans will not notice it, but a system sure can/will.
Most software nowadays is very complicated.
Let's say : Did you ever typed a 2500 pages letter without making a typo?

As far as the update (I recommend a clean install) of version 2014.9.0.2013:
Many things have been solved since version 8 and the latest version offers a lot more/better protection.
It sure is worth going through the steps I mentioned earlier.
If you decide to install the latest version, I suggest you spend some time learning to know the new interface and options.