Delete partitions inside a backup image?
Is there a way I can delete a partition that's already in a backup image? Specifically, I wanna delete the main OS partition. I actually just want to copy and paste the contents of this partition onto a folder in my external hard drive. I don't want to keep the main OS partition because when you recover from a backup such as this, it's recovering THE WHOLE HARD DRIVE's size that the partitions were contained in, so you're not just recovering the used space from the main OS partition, you're recovering the whole hard drive's size, which is really annoying and time consuming, not to mention that the recovery inevitably fails somehow anyway. And then what I would like to do is just create a backup image of the other partitions (i.e. Recovery, Reserved, UEFI Boot, ect.) which are notable much smaller in size and that folder with the OS stuff. Is that possible?