Any disk that can be browsed in Finder, can be analyzed with DaisyDisk.
DaisyDisk can scan Time Machine volumes, but it takes somewhat longer, due to the huge amount of files on them.
In certain cases, the disk capacity and usage figures may be incorrect. For example, Drobo disks always report higher capacity than they actually have; some shared network drives may also report misleading data.
Right‑clicking on a volume displays a context menu with some useful commands, so you can eject volumes and view their properties right from DaisyDisk.
Scan time depends mostly on the number of files on disk, not the disk’s capacity.
Dragging folders and disks and dropping them onto the DaisyDisk’s window or Dock icon can be handy, in case if you prefer drag and drop over dialogs.
DaisyDisk treats applications and document packages (bundles) as solid files, just like Finder.
⌘‑clicking any file or folder instantly reveals it in Finder.
You can preview any file by pointing to it and pressing Space. The preview is powered by the same QuickLook as in Finder, so it will pick up any additional QuickLook plugins you install.
You can expand the “smaller objects” item in the sidebar panel, by clicking on it. Otherwise, all files and folders that are too small to be visible on the sunburst map, are consolidated to reduce visual noise.
Scanning a disk in the Super-User mode takes a little longer than in normal mode, but allows analyzing restricted folders.