How easy is it to make your own QR Code?
Will your QR Code be "clean" and send the user directly to your website, or will your QR code first send the user to a "redirection" website?
Avoid losing your data or getting locked out of your data from a cloud provider.
Consider saving a copy of your files on local, USB connected storage. If you need to save more than 1-2 TB of data, you might try the Seagate Backup Plus Portable Storage - 5TB STHP5000402. It's compact and works well.