If some files and components of the program are still left in the system, that means the program is not completely removed and uninstalled.
Those leftovers will slow down your computer and stuff your system with invalid files as well as result in many problems for your life, such as strange error popups and unable to install other programs.
Also, on occasion it has taken up 50% of my processing power for about 10 seconds, then disappeared, then popped up again about 30 seconds later, and just kept on doing that for a long time. Found this in C:\Program Files\Iron Mountain\Connected Backup PC\.
It appears to start or manage the backup along with Agent in the same folder.
As i see it is a part of the Install Shield Update Service that connects your software programs to their available updates.