Remember to regular scrub your RAID arrays! Usually, you have to manually initiate it from the RAID card web gui, but for the Areca 1680 series, you can schedule RAID set scrubbing.

Scrubbing is ESPECIALLY important for RAID 5 arrays, otherwise you very likely will have a double-drive failure, which is, of course, fatal for RAID 5.

Areca recommends scrubbing at least once a week.