in the event of a non-catastrophic disk failure, there is a reduced risk of data corruption.
There's a good chance that you already use blockchains without even realising it. Unless you are a data storage nerd, there is no need to pay much attention to it.
I think of blockchains in much the same way that I think about firewalls and anti-virus software. Good things to have, but if it is working properly, you shouldn't notice that it is there.