Andy from Backblaze here: We collect SMART stats data at the current time on a daily basis, but none of those stats record data volume as best as I can tell, at least for hard drives. Some of the SMART stats for SSDs look like they could do that, or at least imply they could, but we'd have to dig into those numbers to see if 1) they are actually reported, and 2) they are what we think they are, and 3) how consistent they are across the myriad of SSD manufacturers, so I wouldn't get my hopes up.
Biting the hand that feeds IT
