The Synology C2 Insider’s Guide
Everything we know about Synology C2 in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Synology C2
The Insider’s Guide
Synology's cloud storage and backup for NAS and S3 workloads
Every plan, grade, refund rule and rival among file storage and sync services, read from Synology C2’s own pages.
Made by Synology Inc. · checked Nov 12, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Synology C2’s own pages, its app-store listings and our grades. Every fact in it is on Synology C2’s page too, where it is kept up to date. Checked Nov 12, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.0
GPA, above 4 of the 45 other file storage and sync services we grade
Synology C2 is a family of cloud services from Synology: C2 Storage for backing up and syncing Synology NAS data, C2 Object Storage with an S3-compatible API, and backup for PCs and Microsoft 365. Data can be held in Frankfurt or Seattle data centers.
To get you started, here are 9 things to know about Synology C2, taken from its own pages and our grades.
- 1
Best for backing up a Synology NAS to the cloud
It isn't a general file sync app, the OneStorage price is only shown by a calculator, and some backup options need the Advanced plan.
- 2
Paid plans start at $7.99 a month
As its pricing page puts it: $7.99 per TB / month (C2 Object Storage).
- 3
You can try it first
30-day free trial, no credit card required
- 4
It runs on 4 platforms
Web, macOS, Windows and Linux.
- 5
C2 Storage for Hyper Backup
Backs up Synology NAS data with versioning, deduplication on the Advanced plan and client-side AES-256 encryption.
- 6
Hybrid Share
Connects branch-office NAS devices to central cloud storage, streaming requested files and caching frequent ones locally.
- 7
C2 Object Storage
S3-compatible API with versioning and Object Lock, in EU and US data centers, with 11 nines of durability.
- 8
A 2.0 GPA, above 4 of 45
That is against the other file storage and sync services we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
To replace Synology C2 you would be making files kept in step across devices without losing one. That is not a weekend's work, with an AI app builder or without one.
Synology C2 at a glance
- Pricing
- Free trial, from $7.99 per TB / month (C2 Object Storage)
- Free plan
- No
- Free trial
- 30-day free trial, no credit card required
- Runs on
- Web, macOS, Windows, Linux
- Made by
- Synology Inc.
- Category
- File Storage & Sync
- Our grade
- 2.0 GPA, fair
The report card
Best for backing up a Synology NAS to the cloud
Synology C2 is cloud storage and backup that works with Synology's own NAS boxes, with S3-compatible object storage at $7.99 a terabyte a month. It isn't a general file sync app, the OneStorage price is only shown by a calculator, and some backup options need the Advanced plan.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | $7.99 a TB a month for Object Storage, before VAT, which is between the middle ($7) and the dearer quarter ($9.99) of file storage. OneStorage has no readable price. |
| Free plan and trial | C | A 30-day free trial with no credit card needed. There's no free plan. |
| Features | C | Hyper Backup storage, Hybrid Share, S3 object storage, web restore and Express Box. But it's built for Synology NAS, and deduplication and custom rotation need the Advanced plan. |
| Ease of use | C | No rating on record. You connect it from a Synology NAS or an S3 tool and set up your own backup jobs. |
| Platforms and integrations | C | Web portal plus Mac, Windows and Linux programs, with Veeam, Cyberduck and Synology DSM. No phone app is named. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Synology C2 is for
- Fits if you own a Synology NAS and want an offsite copy
- Works for teams that want S3 object storage at a flat per-terabyte rate
Who it is not for
- Not for you if you want a consumer file sync app, because C2 is built around Synology NAS and S3 workloads
- Skip it if you don't own Synology hardware or an S3 tool to connect
- Watch out: prices exclude VAT, which is added at checkout
- Tight if you want deduplication or custom rotation, which need the Advanced plan of C2 Storage for Hyper Backup
- Watch out: OneStorage pricing is shown only by a capacity calculator
Good to know
Good for
- Synology NAS owners who want an off-site backup
- Multi-site businesses syncing branch offices
- Teams needing S3-compatible storage with fixed per-terabyte pricing
Worth knowing
- C2 Storage is designed for Synology NAS; it is not a general-purpose consumer file sync app.
- The OneStorage price is shown only by a capacity calculator, so no figure was readable; $7.99 per TB is the Object Storage rate on its page.
- Prices exclude VAT, which is added at checkout by billing address.
- Deduplication and custom rotation need the Advanced plan of C2 Storage for Hyper Backup.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$7.99
A month to start
Synology C2 is a paid product with a free trial, starting at $7.99 per TB / month (C2 Object Storage).
C2 Object Storage
$7.99
per TB / month
S3-compatible storage with free retrieval, no API or deletion fees and no minimum storage duration.
C2 OneStorage
Custom
One capacity plan covering Hyper Backup, Hybrid Share, Object Storage and Surveillance365; price shown by a calculator.
Trying it first
30-day free trial, no credit card required
Read from c2.synology.com on Nov 12, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
4
Places it runs: Web, macOS, Windows and Linux
Synology's cloud storage and backup for NAS and S3 workloads. Here is what it does, as its own site describes it, and what it covers: end-to-end encrypted, public API, file sync, file management.
But it's built for Synology NAS, and deduplication and custom rotation need the Advanced plan.
- C2 Storage for Hyper Backup
- Backs up Synology NAS data with versioning, deduplication on the Advanced plan and client-side AES-256 encryption.
- Hybrid Share
- Connects branch-office NAS devices to central cloud storage, streaming requested files and caching frequent ones locally.
- C2 Object Storage
- S3-compatible API with versioning and Object Lock, in EU and US data centers, with 11 nines of durability.
- Web portal restore
- Browse and download backed-up files from a browser, or restore with Hyper Backup Explorer on Windows, Mac and Linux.
- C2 Express Box
- A physical device for moving the first large batch of data into C2; options are available by contacting Synology.
Where it runs
- Web
- macOS
- Windows
- Linux
What it works with
- Veeam
- Cyberduck
- Synology DSM
Synology C2 is made by Synology Inc.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
4/45
Other file storage and sync services it is graded above
Synology C2's GPA of 2.0 is higher than 4 of the 45 other file storage and sync services we grade, and level with 8.
Its paid plans start at $7.99 a month, against a middle price of $6.32 for the category: 24 of the 37 others that charge start lower.
On features, ease of use and platforms it scores 2.0 out of 4. 21 tools score higher and cost less.
Each grade against the category
Every bar is all 46 file storage and sync services we grade, cut by the letter each got. Synology C2’s own letter is outlined.
- CValue for moneyAbove 9 of 45
- CFree plan and trialAbove 4 of 45
- CFeaturesAbove 1 of 45
- CEase of useAbove 9 of 45
- CPlatforms and integrationsAbove 0 of 45
Price against what you get
Each dot is one of 40 file storage and sync services. Further left costs less; higher up scores better on features, ease of use and platforms. Synology C2 is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Synology C2 you would be making files kept in step across devices without losing one. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 33 of the 45 other file storage and sync services grade higher. It costs $95.88 a year.
What you could not
- Files kept in step across devices without losing one.
- A file manager working directly on your disk.
- Apps for macOS, Windows and Linux that stay in step with each other.
- It plugs into other products, Veeam, Cyberduck and Synology DSM among them, and has an API.
- End-to-end encryption done properly.
- A physical object that comes with it.
What this rests on. Synology C2’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Synology Drive, Backblaze B2, Wasabi, IDrive and Storj
The 5 tools Synology C2 is most often weighed against, with where each one differs from it.
- 2.2GPA
Synology Drive
Free
Private-cloud file sync and sharing that runs on a Synology NAS.
- Synology Drive has a free plan. Synology C2 does not, though it has a free trial.
- Only Synology Drive lists iOS and Android apps.
- Synology C2 is end-to-end encrypted, according to its own site.
- 2.0GPA
Backblaze B2
Free plan · from $6.95/mo
S3-compatible object storage billed per terabyte.
- Backblaze B2 has a free plan. Synology C2 does not, though it has a free trial.
- Only Synology C2 lists macOS, Windows and Linux apps.
- Synology C2 is end-to-end encrypted, according to its own site.
- 2.2GPA
Wasabi
Free trial · from $7.99/mo
S3-compatible cloud object storage at a flat per-TB rate.
- Only Synology C2 lists macOS, Windows and Linux apps.
- Synology C2 is end-to-end encrypted, according to its own site.
- Synology C2 also covers file sync.
- 3.2GPA
IDrive
Free plan · from $0.25/mo
Cloud backup for many devices in one account, with a sync folder.
- IDrive has a free plan. Synology C2 does not, though it has a free trial.
- Only IDrive lists iOS and Android apps.
- Synology C2 is end-to-end encrypted, according to its own site.
- 1.8GPA
Storj
Free trial · from $7/mo
Distributed S3-compatible object storage priced per terabyte.
- Synology C2 is end-to-end encrypted, according to its own site.
- Synology C2 also covers file sync.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Synology C2 free?
No, Synology C2 is a paid product, but you can try it first. 30-day free trial, no credit card required.
How much does Synology C2 cost?
Synology C2 lists 2 plans. C2 Object Storage: $7.99 per TB / month.
What platforms does Synology C2 work on?
Synology C2 is available on Web, macOS, Windows and Linux.
Does Synology C2 have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Synology C2 is listed for Web, macOS, Windows and Linux.
Does Synology C2 have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Synology C2 is listed for Web, macOS, Windows and Linux.
Is Synology C2 open source?
Synology C2 is not described as open source on its own site, as read on Nov 12, 2026.
Is Synology C2 end-to-end encrypted?
Synology C2 describes itself as end-to-end encrypted on its own site. Nobody here has audited that.
Does Synology C2 have an API?
Yes. Synology C2 offers a public API, according to its own site.
What does Synology C2 integrate with?
Synology C2's listing names Veeam, Cyberduck and Synology DSM. A listing names up to eight integrations, so it may connect to more.
Who makes Synology C2?
Synology C2 is made by Synology Inc.
What are the alternatives to Synology C2?
The closest alternatives to Synology C2 in our directory are Synology Drive, Backblaze B2, Wasabi, IDrive and Storj.
How does Synology C2 compare with other file storage and sync services?
Synology C2's GPA of 2.0 is higher than 4 of the 45 other file storage and sync services we grade, and level with 8.
Is Synology C2 good value for money?
ToolGPA grades Synology C2 C for value for money. On features, ease of use and platforms it scores 2.0 out of 4.
Could I make my own version of Synology C2?
To replace Synology C2 you would be making files kept in step across devices without losing one.
Where this guide comes from
The prices, plans, platforms and features were read from Synology C2’s own pages on Nov 12, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from Synology's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Synology Inc. Prices change, so check c2.synology.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
5,038
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
5,038
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Synology C2, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/synology-c2
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Synology C2: The Insider's Guide", checked Nov 12, 2026. https://toolgpa.com/tools/synology-c2
Know someone choosing between file storage and sync services?
Send them this guide: toolgpa.com/tools/synology-c2/guide
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See our other guides
The best-graded file storage and sync services after Synology C2, each with an Insider's Guide of its own.
- File Storage & Sync Insider's GuideEvery one of the 46 file storage and sync services we grade, compared
- Google Drive Insider's GuideCloud storage tied to Google Docs, Gmail and Photos3.6 GPA
- Filen Insider's GuideEnd-to-end encrypted cloud storage from Germany with open source apps3.4 GPA
- Microsoft OneDrive Insider's GuideMicrosoft's cloud storage, bundled with Microsoft 365 plans3.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Synology C2’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Synology C2 is a trademark of its owner, and this guide is not made, paid for or approved by Synology Inc. Prices and plans change: check c2.synology.com before you buy.