flatbield

You could install a hot mount SATA drive slot too if your using a workstation. I actually have 3.

Is there a reason to not just use du? Or use either and just look at certain trees? Or just get a bigger drive so it does not matter?

Keep in mind that you actually do have control over what you and your reports use for software and their license compliance. Otherwise not your problem. Beyond that, it is an issue for legal anyway and management.