Langmeier Backup FAQ

Efficient data backup and synchronization - Why a two-way sync is not a good idea

A frequently asked question in the field of data backup is: How can you back up files from multiple computers to a central NAS and ensure that all systems remain up to date? Recently, a customer approached us with a similar scenario:

“I have one main computer from which I want to back up files to a NAS drive. I also have a second computer that I would like to use to access the NAS backup, edit files, and save changes. These edited files should also be updated on my main computer.”

Two-way synchronization and data backup Two-way synchronization and data backup: two distinct concepts you should understand.

As IT security experts, we would like to emphasize: It is generally not advisable to access a backup archive directly to modify files. Implementing reverse synchronization (two-way sync) would undermine the fundamental purpose of data backup.

Why a Passive Archive Matters

The core principle of data backup is to maintain a passive archive. This means that the backup should not be used for editing or changing files. Doing so compromises the integrity and reliability of your backup. If you enable reverse synchronization, your backup effectively becomes an “active” storage solution, which poses significant risks from a data security perspective. In such a scenario, data loss is almost inevitable.

The Ideal Solution

A more effective approach is to utilize cloud storage solutions such as OneDrive for Business. Cloud storage enables teams to access, edit, and collaborate on files in real time—without compromising the integrity of your backup. You can then back up your cloud storage to the NAS, ensuring that your data remains protected at all times.

It is important to note that cloud storage does not replace a true data backup—it simply complements it by facilitating collaboration and synchronization. The actual backup should still be performed to a NAS or an external backup archive to guarantee data security and recoverability.

Conclusion

To keep your data truly secure while enabling seamless collaboration, it is essential to clearly separate storage and backup. Use cloud storage for data exchange and teamwork, and maintain your backup on a dedicated, passive archive. This approach ensures that you retain full control over your files and can always access the most current, unaltered versions in case of an emergency.

about the author
Founder and CEO of Langmeier Software

I don't want to complicate anything. I don't want to develop the ultimate business software. I don't want to be listed in a top technology list. Because that's not what business applications are about. It's about making sure your data is seamlessly protected. And it's about making sure everything runs smoothly while you retain full control and can focus on growing your business. Simplicity and reliability are my guiding principles and inspire me every day.
 

Look it up further: Data backup, Cloud storage, NAS backup, IT Security, Cloud backup, Data protection

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