Disk Usage Analyzer on Synology

Solution 1:

Synology has an App on it's DSM store called Storage Analyzer, which provides a very friendly user interface to view usage by folder, user, file types, duplicates, etc... It also keeps a history by analyzing periodically...

Solution 2:

NCDU is the closest I can find. Works really well though. Simple to use as you only have to copy the file to the diskstation, then terminal in and run. Some more instructions:

http://forum.synology.com/enu/viewtopic.php?f=90&t=82232

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Solution 3:

Mount the Synology volume from a Linux workstation running Gnome, and run Disk Usage Analyzer on it.