What Is Synology C2 Object Storage?
Synology C2 Object Storage is Synology's S3-compatible cloud storage service, hosted in European, North American, and Asia-Pacific regions. OurClone connects to C2 Object Storage for sync, transfer, encrypted backup, and mount workflows.
Official website: https://c2.synology.com/en-global/object-storage
- S3-compatible storage from Synology with regional plans for EU, US, and APAC.
- Connects with Access Key + Secret Key created in the C2 Object Storage console.
- Useful as an off-site OurClone backup destination, especially for Synology NAS households.
What OurClone Supports for Synology C2 Object Storage
| Operation | How it works in OurClone |
|---|---|
| Sync | Keep a folder on Synology C2 Object Storage synchronized with another cloud storage account or a local folder. OurClone compares file changes and updates only what needs to change. |
| Transfer | Copy or move files between Synology C2 Object Storage, your Mac, and other connected cloud providers. Transfers run through your local computer, so you stay in control of the data path. |
| Backup | Create an encrypted backup repository on Synology C2 Object Storage, then save snapshots of local folders. Later snapshots are incremental, so unchanged files do not need to be uploaded again. |
| Mount | Mount Synology C2 Object Storage as a local directory in macOS or Windows, then browse and manage remote files from the operating system file manager. |
Synology C2 Object Storage Upload and Download Limits
These limits come from the storage provider or protocol, not from OurClone. OurClone still has to respect provider file-size caps, API quotas, bandwidth rules, account storage quota, and server-side throttling.
| Upload limits | Synology C2 Object Storage follows S3-style multipart upload behavior, typically 5 MiB to 5 GiB part size with up to 10,000 parts per object, and supports objects in the multi-terabyte range. Final per-bucket storage and traffic depend on the chosen C2 plan. |
| Download limits | Downloads are limited by the C2 plan’s outbound traffic allowance, regional bandwidth, and request-rate quotas rather than a small per-download cap. |
| OurClone tip | Pick the C2 region closest to your data and confirm the plan’s storage and outbound traffic before scheduling a long-running OurClone backup. |
Source: Synology C2 Object Storage help
How to Add Synology C2 Object Storage in OurClone
Synology C2 Object Storage connects through S3-compatible access keys in OurClone.
- Sign in to the Synology C2 console and open Object Storage.
- Create a bucket in the chosen region, then open Access Keys and generate an Access Key ID + Secret Access Key for OurClone.
- Note the regional S3 endpoint, for example
eu-001.s3.synologyc2.net. - Open OurClone, click Add Storage, select Synology C2 Object Storage (or S3 Compatible), enter the endpoint, credentials, region, and bucket, then connect.
Sync and Transfer Workflow
After Synology C2 Object Storage is connected, open the Migrate area in OurClone. Choose Synology C2 Object Storage as the source or destination, select the folders you want to work with, then choose the task mode.
- Copy duplicates files while keeping the source unchanged.
- Move transfers files and removes them from the source after completion.
- Sync keeps the destination aligned with the source folder.
Task progress is visible in the Task tab, including completed, skipped, and failed files.
Backup Workflow
For backups, first create a backup repository on Synology C2 Object Storage. A repository needs a name, a storage path, and an encryption password. Keep this password safe because it is required for both future snapshots and restores.
- Open Backup and create or choose a repository on Synology C2 Object Storage.
- Open the repository and click New Backup.
- Select local folders such as
~/Documents,~/Pictures, or a project folder. - Start the snapshot. The first run uploads the full selection; later runs are incremental.
- Use Restore from a backup record when you need to recover files to a local directory.
Mount Synology C2 Object Storage as a Local Folder
OurClone can mount Synology C2 Object Storage as a local operating-system directory. This is useful when you want to browse cloud files in Finder or File Explorer, open files from desktop apps, or copy files with the same habits you use for local folders.
- Open the mount area in OurClone and select your connected Synology C2 Object Storage account.
- Choose the remote path you want to expose locally.
- Pick a local mount point, then start the mount.
- When finished, unmount cleanly from OurClone before disconnecting your network or shutting down.
Best Practices for Synology C2 Object Storage
- Use a clear folder naming convention such as
/ourclone-backups,/sync, or/archive. - Confirm that your Synology C2 Object Storage account has enough storage before running a large migration or backup.
- Run a small test sync or restore before relying on a new workflow for important files.
- For large first-time jobs, keep your computer awake and connected to a stable network.
- Pick the C2 region that matches your data residency and latency needs before uploading large datasets.
- If authentication fails later, regenerate the C2 access key before restarting the task.