secure peer to peer backup synchronization


syncosync is a backup appliance, normally a Raspberry Pi4 with a USB3 connected hard disk drive. The main function is to receive backups from other computers on the local network and synchronize these backups to a similar device at a different, remote place. The device on the other side of the network does the same, so two devices on two sides of the network are always in sync.





syncosync – low price, automated refresh, fast disaster recovery


How it works:

Alice and Bob live in the same town: Berlin.

Both of them are setting up a syncosync box and after a few setup steps, they have secured their digital live in the most economic and most social way: they are storing their backups on their own syncosync box which are mirror to each others syncosync boxes.

After some time, the systems are in sync. Now, if Alice’s house is on fire and she is not able to rescue anything her house, may be she needs access to all of her data very fast: scans of contracts, important mails etc.

So she takes a taxi to Bob’s place. He hands her out his syncosync box and – as long as Alice can remember the passwords of her backup, she can restore the data with the speed of a local network – not low speed  of the internet even worse in a hotel’s WIFI.


backup data is encrypted on all disks and transferred over encrypted connections.


backups could be restored either from the local syncosync system but also from the remote system after fetching it from the backup buddy


as the two disks are mirrored over the secured connection, there are no expensive raid arrays necessary. Power consumption is in the lowes possible area.


the setup is graphical and about as complicated as setting up a wifi access point. The backup software on the the connected systems backups the data in regular and automatic manner


syncosync is OpenSource and free to use and modify for everybody


You decide who hosts your encrypted backups and provides you with those any time when needed


Featureful and clean UI

The UI is used for setting up the complete syncosync box, not only the service but also all other parameters for networking, hostname, mail-servers etc.

After setting up the disk and the sync connection to the sync buddy, just add the backup accounts for all the devices in your household or company and you are ready to go. The WebUI gives you a status about the space used by the accounts and the connection to your buddy – but normally you do not have to monitor anything. syncosync sends you a mail if there are any issues.



Easy to install, easy to use

Buy a Raspberry Pi4, a micro SD card and a 2.5″ HDD and you are ready to go. Oh, no, buy another one for your backup buddy 🙂

The setup is finished in about 15-30 minutes and then you are ready to go.

After that, you will hopefully not see and hear anything from the syncosync box for a long time – except you need to restore data or you have lost all your local data through a disaster.

If the syncosync box needs maintenance, it will send you a mail, there is no need for regular checks.

Supported and documented

syncosync has a build in help function and it’s manuals are bundled with the software as pdf and html version. If you want to take a look at the actual manuals, you can find them also here:

Or you can browse through all available manuals and formats.

If you want personal support, come and visit our forum.


syncosync is free and open source software under the GNU Affero General Public License (AGPL)

This means, you could use and modify syncosync in both private but also commercial environments without paying any royalties or license costs. As we - the developers - would love to improve syncosync and put all our working time into the project, we need money for our livings.

Help us to reach this goal! Support us on Patreon!


Help us to improve syncosync!

We need helpers for:

  • Coding (Python, Angular)
  • UX Design
  • Translation
  • Documentation