Cryptomator

While storing your files in the cloud such as Dropbox, Google Drive, and OneDrive is a great way to make those files available anywhere and any time on any computers, there is one inherited danger of data breach due to a hack because the data is stored on someone else's computer that is accessible over the Internet. Granted, if you have a strong password and use 2-factor authentication, the odds are low that this hack will happen. Nonetheless, if you feel more comfortable if there is a hack, the data stored on these servers is not accessible by the attackers, the you should encrypt the data using your own encryption. This way, even a rogue employee at these cloud storage services cannot see your files.

Cryptomator is one such solution.

https://cryptomator.org/

Download Youtube videos locally

http://www.pcmag.com/article2/0,2817,2476563,00.asp?

The site mentioned that allows you to download videos at 1080p or even 4K is youtubemonkey.com. You don't need to install any program locally. Moreover, there seems to be no limitation on how long the video is. I have successfully downloaded a nature video at 4K that runs an hour and 7 minutes.

If you want a more powerful downloader, try 4K Video Downloader

https://www.4kdownload.com

The free version has some limitations.
https://www.4kdownload.com/buy-ab/videodownloader?source=videodownloader&ui_source=default

Be sure to try out their other programs. Also, visit their blog for some great help on related programs.

https://www.4kdownload.com/blog/