Hi.....I think it would be simpler to use the Archive Manager in Linux Lite and combine what's on your SD card into a *.iso file. It's like zipping it using WinZip, but instead you're zipping it into a *.iso (ie. image) file. If that isn't sufficient, and if Disks gave you an issue over your partitions, Clonezilla would be a suitable choice.
turnkey pcb
turnkey pcb