You definitely want to enable Synology Data Scrubbing, here's why. 

Let's take a look at what is data scrubbing and how it works to not only detect but fix data errors on your NAS hard drives. Then, let's go step-by-step to enable it on your Synology NAS. As a bonus, I'll also show you how to enable SMART reporting.
my IT service company - Juneup - www.juneup.com/
0:00 - intro
0:29 - why scrubbing is important
2:40 - how scrubbing works
10:54 - btrfs checksum
12:00 - how to enable scrubbing
14:48 - how to enable smart reporting

Наука