What Where
Program files C:\Program Files (x86)\Fungusware\Xackup v2
Data: jobs, saved servers and locations, settings, license C:\ProgramData\Fungusware\Xackup
Backups of the data folder, made before each upgrade C:\ProgramData\Fungusware\Xackup-backups
Windows service XackupAPI (starts at boot)
Port TCP 19177
Firewall rule (only if other computers may connect) Xackup API
Shortcuts Start menu, and the desktop unless -NoDesktopShortcut was used

Useful commands

Check the service:

Get-Service XackupAPI

Restart it:

Restart-Service XackupAPI

Check that the port is listening:

Get-NetTCPConnection -LocalPort 19177 -State Listen