You may want to disable the nightly ilog backups that are retained in this location - "C:\Program Files (x86)\Impero Solutions Ltd\Impero Server\Data\Logs\Backups" or your Impero Log custom location, as you may have other software that backs up your server such as Veeam and stopping this backup may save you some space.
To stop these backups you will need to create the following registry key;
32 Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Impero Solutions Ltd\ImperoV3
64 Bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Impero Solutions Ltd\ImperoV3
DWORD Name: WHL_EnableBackups
DWORD Value: 0
**Once this registry key value is in place you will need to restart the ImperoServerSVC Service