synology what is data scrubbing
Data you store on the hard drives is subject to silent corruption ( called Bit rot). With Data Scrubbing, your data is checked periodically to ensure that there is no bit rot and data is accurate. If an inaccuracy is found, Synology DSM will attempt to repair the data using the redundant copy. So with Data Scrubbing the chances of your data Silently getting corrupt is minimized.