SC430nut wrote: ↑
Thu Aug 08, 2019 7:45 pm
My question is: if I install a program on my Rpi 3B+ using a USB thumb drive, will the executable code be written/appended to the os image on the uSD card?
That depends on what you re using the USB thumb drive for. It's possible to boot and run a 3B(+) from a USB drive with no SD card at all, or you can have /boot on the SD card and / (the root filesystem) on USB. If your Pi is running entirely from the SD card, and the USB thumb drive is just for storage, then yes, software that is installed in the typical way will be added to the OS on the SD card.
However, installing software from a USB drive is not the way it's typically done, so you will have to clarify that point for more information (software for Linux is normally installed from online repositories, not by downloading software installers like on Windows).
If so, does that mean that I need to copy the entire uSD card to create a backup with dd?
Using dd is a very poor way to backup your system. Look for some tutorials on making Linux backups for more reliable solutions.
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?