Simple inexpensive cloud backup? - lemy.lol

My goal is to to fully ditch Google Photos for Immich. I have about ~3TB of photos and videos. Looking for a super simple way of backing up the library to cloud storage in case of a drive failure. Ideally, this will require nothing on my part besides copying files into a given folder. And ideally the storage will be encrypted and have basic privacy assurances. Also if it matters my home server is running Debian.