The only thing that really makes me feel unsafe with paper backups, is the fact that the ink could fade after 20-30 years.
Yeah, paper backups can be a convenient and easy way to store important information, but their durability can be a concern. Based on my experience, prints from an inkjet printer can become unreadable much sooner than the estimated 20-30 years, and this can vary depending on environmental conditions. To mitigate these risks, it is a good idea to use archival-quality paper which are specifically designed to last longer and resist fading. Additionally, in general, laser printers and their toner-based output offer longer lasting prints compared to inkjet printers.