I’m running a Dell laptop on Windows 10 and it was fast running out of disk space of the bootdrive (c:). Checking around and exploring possible housekeeping tasks were hampered by complex security privilege and uncertainty issues. Finally, TreeSize Free provided some important insights leading to investigation and removal of Dell Backup And Recovery Manager and its historical data. The disk space utilization stabilized after this was done.
Results – about 184 GB of occupied hard disk space was freed from the boot drive.