Mini Server makes odd noise from speaker!

Anyone else getting a noise from their Mac Mini server speaker that sounds like a file being deleted?
No regular pattern to when it comes, it's unprompted and happens even when no one is logged on to the network.
I have a (used) Mac Mini 2011 with two (new) 1TB drives in RAID 1 and a clean instal of the latest OS X with all updates applied and the server app purchased two weeks ago from the App Store. It's been doing it (more often in the evenings) almost since I set up the server.
Anyone got any thoughts?

Not so much clicky as just a subtle little buzzing undertone to the ordinary quiet hum of the Mini when the fan's not spun up that makes my brain think "something mechanical needs oiling", IE it's a motory kind of noise like metal moving against metal. (Which I suppose could be the HD spinning on its axel, perhaps, it seems unrelated to any sort of "reading disk now" ticks. Um, yeah, the Mini is probably on the desk a little too close to my right ear that I know what this all sounds like... ) Too, too familiar with HD Clicking Of Death, that was last May's "...THAT ain't right" $300 moment -- I have been backing up religiously since then, believe me! Wouldn't have thought of Disk Utility RE a possible mechanical issue, I'll have a look...

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Mini Server makes odd noise from speaker!

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