I have just downloaded and installed Calibre Portable in a folder on a local hardddisk.
I then transferred settings from C:\Users\<my name>\AppData\Roaming\calibre to the folder in question.
I also transferred my 4 calibre libraries to the folder.
Everything looks as in the "normal" Calibre. (Windows 10)
That was suspiciously easy.
The reason for this transfer is that it will be so much easier to copy Calibre with settings and libraries to another destinations for backup purposes. I don't really need the portable property.
Ny question is, do I miss something compared to the "normal" Calibre?
I use the 64 bit "normal" Calibre.