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Where are 1Password 3.9 backup files stored?

1Password automatically creates backups and stores them in this folder:

~/Library/Containers/com.agilebits.onepassword-osx-helper/Data/Library/Application Support/1Password/Backups

Up to most recent 30 backups are kept at a time. The new backup file is created only when there was a change in your data since the last backup.