This is a question in a similar others on AskDifference about what happens to free space on a disk. But most popular answers refer to different utilities to determine what is consuming space. I already have DaisyDisk and use it to see what consumes space. But what it doesn't show is how the space consumption has changed between dates.

For example, a couple of days ago, I had > 25G free on my HDD. Suddenly, this morning, I saw that my free space was at 0bytes. So something has consumed > 25G in a couple of days.

I haven't been doing anything specific that would consume that much space. I suspect it is backup software that is chewing through my free space, but the problem with tools like DaisyDisk is that they will highlight large disk space usage - but I won't necessarily noticed 25 slots of 1G being consumed.

More importantly, if I could see what has changed in disk consumption (ex: change in a heat map) then I could track what/where disk space is being consumed and track it back to errant process(es).

Are there any such tools available? Something to do comparative analysis based on snapshots/scans that I can take on a nightly basis? I'm running OsX Yosemite (10.10).

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