The next page will show a list of all Google products associated with your account whose data can be backed up. All of them will be selected by default, so make sure to unselect all and select only youtube. An easy way would be to untick the "Select All" button at the top which will unselect all items. Then scroll down and check the "YouTube" option.
To protect your channel from COPPA, you can download all videos in the channel to your computer for backup or re-upload them to other platforms. Since online websites do not support batch downloading of videos, and most of them have suspicious and unsafe ads embedded, thus, it is better to use a safe and reliable tool like Jihosoft 4K Video Downloader.
File backup: If you want to back up only your data (operating systems and programs can be reinstalled, though it’s mildly time- and effort-consuming), a program that backs up just the files you select is a major time-saver. Some programs automatically select the appropriate files if you use the Windows library folders (Documents, Photos, Videos, etc.).
When you’re looking for something to watch or listen to you want something that you’re going to enjoy, but you also want a good amount of value. With downloading an entire YouTube channel, you’re not going to have to worry about that because you’ll be able to check back in on a number of different videos and different episodes that you may or may not have seen before. This also gives you a whole lot more freedom to check out something different without having to worry about downloading yet another episode or video that you don’t have the data for.