If it was me I'd make sure I had a new external drive (in addition to the TM backup drive) and then install a fresh copy of El Capitan on that first. This way you still get the two bootable drives. Once you've tested it and are satisfied all is good, you can then upgrade the internal drive to macOS Sierra. Yet another option is to use something such as Carbon Copy Cloner or SuperDuper to make a bootable copy of your current system onto an external drive. Another option, if you're internal drive has the capacity, is to have two partitions and have El Capitan on one and Sierra on the other. Now, whether this is the best way for you to go about things is up to you. No, there are no issues concerning software licenses in doing this.But, before you can do this you will need to install El Capitan on that external hard drive and then boot your Mac from it and migrate your data etc from the TM backup to that drive. Yes, you can restore the backup from TM to another external HD and use it as a second boot drive.
Yes, you can update the OS on your internal drive to macOS Sierra.Yes, you can use TM to backup your computer, but you're not actually backing up a bootable copy of the OS.Yes, this can work but not exactly in the way you've planned.
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