Let the portable version save in the Application drectory
Currently the portable windows app save data and database on the \Users\username\SafeinCloud.. directory.
In order not to have footprint on the PC the potable windows app shall save data in the application directory, this allow to bring it on usb stick.
Odd Nordland commented
My portable version saves the data in the PortableApps application directory. I have no SafeInCloud directory in \Users\myname\ or elsewhere on the PC.
Could it be that you have installed the PC version in your portable apps directory instead of installing the portable version?