The cache path can be changed as follows.
- Stop Veeam ONE Monitor Server service.
- Run regedit and under HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam ONE Monitor\Service create a REG_SZ value named DiskPerfCachePath, set the desired path (e.g. E:\VeeamONE\Cache).
- Save the value and start Veeam ONE Monitor Server service.
, that Veeam ONE Monitor will not be operational while the service is stopped.