Backing up Google Photos

How I backup my Google Photos, at full image quality, preserving GPS and timestamps, deduplicating identical images to save disk space.

Cloud Backup Storage Options

What Cloud Storage should I upload my backups to? Amazon S3? Azure Blob Storage? Google Cloud Storage? More niche players?

Cloud Backup Software

What software can incrementally backup 1TB+, e2e-encrypted, to cloud object storage, reliably, cheaply?