BackBlaze doesn't have an offline component, so you'll have to handle that yourself, but it's by far one of the most affordable options on the market. Accounts are $5/mo (you get a break if you pay up front for one or two years), and you can add more computers to the same account for another $5/mo. You can read more about Backblaze's pricing options here.
When it’s time to get started, you have to decide whether you want the free version or the pro version that offers a few extra features. From there, you put the URL for the YouTube video or channel that you want to download directly into the link box and select the resolution that you want. You get to pick the outputs, the place to save the information, the subtitle languages and all of the other important features and then you click the button to download. From there, you’re going to be ready to start listening and watching your favorite shows.
Do you prefer to avoid installing software? Video download helper sites do the download work for you, providing conversion and then a download link—you don't have to install anything on your PC. It can take a lot longer, depending on the size and quality of the video you want—a typical two-minute movie trailer in 1080p can be around 30MB—but you can't beat the convenience.
5K Player also features DLNA server playback so videos you grab can be watched on any devices on your home supporting DLNA network; it supports AirPlay for quick playback to supported devices. Pick a video in the library and you can do a quick conversion to MP4, MP3, or even ACC (an audio format preferred by iOS devices). The player didn't like playing back the overly large 4K file though and experienced buffering issues—VLC didn't have any problem with the same file. Ultimately, there's a lot to like about 5K Player, from the price to the features, especially if you look at them as extras on a downloader. But the interface and playback issues may have you looking elsewhere.
Another workaround: Go back to the desktop and try AnyTrans ($39.99 for a single computer), a file manager for iOS devices that has an integrated downloader supporting 900 sites, including YouTube and Facebook. It'll transfer the videos to the iPhone for you over the USB cable. Even if you don't pay for AnyTrans, the download option remains and is free forever.
That said, with Android it is possible to install apps without going through Google. The latest is InsTube – Free Video and Music Downloader just for Android—you can only get it at InsTube's site. You download the APK (Android application package) file to sideload on an Android device. Find it in your device's downloads and click it to install. (You may have to go into your security settings and enable "Unknown sources.") There is a similar side-load app from YTD.
On iPhones and iPads, you'd think there would be no such restriction since Apple and Google aren't exactly the best of pals. But on the few apps I tried in the first edition of this story, not only wouldn't they download from YouTube, they're not even available anymore. One of those apps said in its description, "downloading from YouTube is prohibited due to its Terms of Service." Apple is ensuring that app makers play by the rules—even Google's rules. All the better to get Google to block someone who eventually does something illegal with iTunes downloads.
There are a few common practices for configuring when backups occur. The most common option is on a fixed schedule, such as once a day, week, or month. The second, which we prefer, is to upload file changes whenever they're changed and saved, otherwise known as a continuous backup setting. Services only transfer the modified part of the file in this scenario, so as not to overburden your internet connection or take up unnecessary storage. A third way is simply to upload files manually. Some may appreciate this degree of control, but this method is only effective if you remember to regularly run the backup.
Third-party software is where you will get the best control over downloading online videos. Typically, you paste the URL for the YouTube video you want into the program, and it downloads the highest quality version it can find. For videos in 1080p High Definition (HD) format, that's usually an MP4 file. For anything higher in quality—4K and even 8K videos—the file format is typically MKV.
Backup services vary widely in how they set up and perform backups. For example, the totally hands-free Backblaze automatically encrypts and uploads all your important files without any input. On the other hand, services such as IDrive and Acronis True Image let you choose specific files you want from a file tree. Note that some services restrict you from backing up specific file types or using particular sources, such as from an external or network drive. Make sure the service you choose supports all your needs.