For cloud backup of a Synology NAS, the knowledge base mentions these options:
- Hyper Backup: can back up a Synology NAS to Cloud/NAS/External HDD/rsync server and supports public clouds as a backup destination. It supports multiversion backups and version rotation.
- Cloud Sync: can connect your Synology NAS with Google Drive, Dropbox, and other public cloud services and use one-way synchronization to back up data from your NAS to public clouds.
- Active Backup for Google Workspace / Microsoft 365: this is for backing up Google Workspace / Microsoft 365 data, not a general NAS-to-cloud backup.
- For C2 Storage, the KB says that for an Entire System Backup in Hyper Backup, you select C2 Storage and sign in, and you need a C2 Storage Advanced Plan before launching the backup task.
- For Google Drive, the KB says Cloud Sync can back up your Google Drive data to your Synology NAS in real time, and the DSM 7.1 guide says one-way sync can be used to back up data from your NAS to public clouds.
- For Backblaze B2, the provided fragments only show the b2 command-line reference and community discussion; they do not show a Synology backup app or a KB procedure for using Backblaze B2 as a Synology NAS cloud backup destination. The guide notes that Hyper Backup supports public clouds generally, but the fragments do not confirm B2 specifically.
So, based on the provided sources, the documented Synology way to back up a NAS to the cloud is mainly Hyper Backup for cloud destinations and Cloud Sync for synchronization-based cloud backup.
Sources used: [2], [3], [5], [12], [15]