I export my contacts as a file and copy it to my pc, an external HDD and several cloud providers. Anything I store in the cloud is encrypted with Rclone first. There is a nice client available for Android. I don’t pay for cloud storage so I only use the free tiers.
I guess this is only practical if you rarely make changes to your contacts.
Fire
Electrocution
Blunt trauma
This is especially dangerous if you’re a data hoarder. It’s a slippery slope that can result in you scalping stuff like old DVRs for drives. Your computer might get very heavy.