If you handle a lot of photos, work documents, or personal files, sooner or later you'll need a reliable way to Maintain up-to-date backups without going crazy copying everything manuallyFreeFileSync has become one of the most appreciated tools precisely for that: automating synchronization between folders and disks in a clear and very flexible way.
Throughout this article we will look in detail How FreeFileSync works, what types of synchronization it offers, and how you can use it to make efficient local backups both on Windows and macOS and Linux. We'll also see some practical examples, its advanced options, and how to install it on distributions based on... Ubuntu.
What is FreeFileSync and why is it so useful?
FreeFileSync is a program folder comparison and synchronization designed to create and maintain backups without having to copy all the content over and over again. Its philosophy is very simple: it analyzes two locations (source and destination), detects what has changed, and only transfers what is essential.
It is a software Free and open source, completely free and cross-platformAvailable for Windows, macOS, and Linux, it's not limited to local disks: it can also work with network shares, remote servers (FTP, FTPS, SFTP), and even MTP devices like mobile phones or cameras.
Instead of always making a full copy, FreeFileSync It calculates the differences between one folder and another and decides which files are new, which have changed, and which have been deleted.From there, it respects the synchronization strategy you define, making it a very versatile solution for continuous backups.
This is especially interesting when you work with very large folders or folders located on a network, where copying everything each time is impracticalThanks to its incremental approach, you save time, network consumption and space, while keeping your data safe.
How FreeFileSync compares files and detects changes
The heart of FreeFileSync is its comparison engine, which allows you to Analyze two folders and classify each file according to its status on both sides.In practice, when you press the "Compare" button, the program examines the source and destination content and displays a detailed list of differences.
To carry out this comparison, FreeFileSync offers Several criteria you can choose from depending on whether you need more speed or more precisionThe most common methods are comparison by date and file size, and comparison by binary content, which is slower but absolutely reliable.
Thanks to this analysis, the program can detect situations such as new, modified, deleted, or conflicting filesEach case is clearly displayed on the interface and represented with icons and action arrows, so you can see at a glance what will happen after synchronization.
For example, when one folder has files that don't exist in the other, they are marked as new elementsIf the name is the same but the content or date has changed, they are considered modified filesIf they are only present on one side because they have been deleted on the other, FreeFileSync classifies them as eliminated or to spread, according to your synchronization strategy.
In the event that the same file has modified in both locations since the last synchronization, the program marks it as a conflict.This allows you to manually decide which version to keep or how to resolve the discrepancy without automatically overwriting important data.
Synchronization and local backups: types of strategies
Once the differences are detected, FreeFileSync offers you Multiple synchronization modes to adapt the behavior to what you want to achieveIn the realm of local backups, these strategies are key to avoiding losing changes and keeping folders aligned.
One of the most useful backup methods is to copy only new or modified files from the source to the destinationWith this approach, your backup folder is updated with the latest versions without deleting anything that was already there, ideal for a backup that only grows.
You can also set up synchronization. bidirectional, in which both folders remain identical at all timesIn this scenario, changes you make on either side are replicated on the other, which is perfect if you work, for example, with two computers or with an external hard drive that you use both at home and in the office.
In addition, the program lets you choose from several predefined rules, such as “Update”, “Mirror”, “Bidirectional” or custom settingsIn many cases, you simply need to choose the option that best suits your use case (one-way backup or mirror folder) and let FreeFileSync handle the rest.
If you need even more granular control, you have Advanced options to define behavior when files are deleted, renamed, or movedas well as to decide what to do when conflicts arise. This way, you can adjust synchronization for very specific projects without compromising the security of your data.
Practical example: copying only new files between two folders
A very typical use case for FreeFileSync is: Combine scattered content without duplicating files or wasting time manually reviewing.Imagine you have a main folder with your music collection and another with new songs that you gradually add.
In this scenario, you could, for example, have your left folder main music directory And as a right-hand folder, a secondary collection where you download or save new tracks. What you want is to send only the files that aren't already in the main folder, without changing anything else.
To do this, open FreeFileSync and, in the two panels at the top, You choose the folder paths using the select directory buttonOn the left is the main folder, on the right is the folder containing the new songs.
Then you go into the synchronization settings (the gear icon) and define the appropriate rule, for example, a strategy that copies only the new elements in one directionYou can adjust the options until the action icons for each file show exactly what you want to happen.
When you're clear on it, you press the button Click “Compare” to have FreeFileSync analyze both locations and list the differencesYou'll see in the list which files will be copied from one folder to the other and which items will remain intact, all before touching any real data.
With the preview in front of you and everything checked to make sure it fits, it's time to click. “Synchronize” so that the program executes the operationsA confirmation window will appear; you can press "Start" and the copying process will begin, showing the progress in real time.
If you want to be on the safe side, before this step you can use the option Click “Show sync preview” to see the detailed list of planned actionsThis function allows you to see what will happen without risk, which is highly recommended if it's the first time you're working with an important folder.
Comparison and advanced filtering options
FreeFileSync not only compares by default, it also lets you Refine the way changes are detected and files are included or excluded. in a synchronization task. This is useful when working with complex projects or directories with thousands of items.
Among the comparison options you can select methods based on modification date and file size, or a full binary comparisonThe first approach is faster and is usually sufficient for most users, while the second ensures that the content is exactly the same byte for byte.
Another important feature is the possibility of exclude specific files or subfolders from synchronizationThrough filters you can, for example, ignore temporary files, cache directories, or specific file types that you don't want to copy.
You can also configure how It handles symbolic links, moved and renamed files.FreeFileSync is able to detect these cases and avoid copying them completely, reducing the number of operations and making the process more efficient.
In more technical environments, advanced options also allow you to customize the behavior of logs, error reports, and level of detail in reportsso you can review what happened in each synchronization without needing to monitor everything in real time.
Profiles, automation, and background execution
When you find a sync configuration that works well for your situation, ideally you not having to repeat the entire adjustment process every timeFreeFileSync makes this easy through profiles that you can save and reuse whenever you need them.
A profile stores the folders involved, filters, comparison mode, and synchronization strategy, among other parameters. In this way, Simply open that profile and run the task, and the program will take care of everything., which is very convenient for regular backups.
In addition, the software allows convert these profiles into batch jobs which you can launch unattended or schedule using operating system tools (such as Task Scheduler in Windows or cron in Linux).
In these scenarios, synchronization can run at regular intervals without you having to open the graphical interface each timeThis makes FreeFileSync an interesting option for automating continuous local backups.
Users who financially support the project also receive some additional features, such as Integrated automatic updates, parallel synchronization, portable version, and silent installation optionswhich further facilitates deployment across multiple teams.
Main features and protocol compatibility
Beyond simply copying files, FreeFileSync incorporates a number of features designed for to cover advanced use cases and high-volume data environmentsMany of them are not visible to the naked eye, but they make a difference in everyday life.
Among his most outstanding abilities is his skill in detect files and folders that have been moved or renamedThis avoids copying them from scratch and significantly reduces synchronization time when you reorganize your directories.
It is also capable of Copy locked files using the Volume Shadow Copy Service (VSS) on supported systemsThis function is essential for backing up files in use, such as open documents or certain system files, minimizing access errors.
The application detects conflicts between versions and allows propagation of deletionsSo, if you delete something at the source, you can decide whether you want it to disappear at the destination as well or be kept as a historical copy, depending on the type of backup you are configuring.
FreeFileSync also offers a Binary file comparison to ensure that the content is identical, specific support for local file systems and network resources and, very importantly, compatibility with remote protocols such as FTP, FTPS, SFTP and MTP devices.
For more complex scenarios, it is possible process multiple folder pairs in a single operationAutomate synchronization as batch jobs and get detailed error reports, so you know exactly what went wrong if something can't be copied or synchronized.
What's new in recent versions and bug fixes
The development of FreeFileSync is very much alive and It receives regular updates that improve stability, performance, and add new features.Recent versions have introduced several interesting changes, both in terms of functionality and bug fixes.
For example, the possibility of overwrite the path of the folder where the records are stored in executions both with a graphical interface and in batch mode, which is useful when managing logs in a specific directory.
Have also been fixed issues related to real-time execution (RTS) and the activation of volume paths by name, which improves the automatic tracking of changes in certain systems.
In the remote protocols section, the following has been corrected problems reading FTP directories that contained wildcard characters, avoiding listing errors and ensuring that all folders and files are displayed correctly.
Other improvements include Adjustments to the rendering of still image overlay graphics in Linux, the suppression of unnecessary error messages when the versioning folder does not yet exist, and fixes related to the removal of folder pairs before comparison.
Finally, the following topics have been addressed: Specific errors occurred when certain parent folders of newly moved files were missing, or when the folder containing the moved items did not exist.as well as errors in the statistics associated with these contexts, thus achieving more predictable behavior.
Installing FreeFileSync on Ubuntu and derivative distributions
If you use Linux, especially an Ubuntu-based distribution, you can Installing FreeFileSync is quite simple using the official packages available on their website.The project offers versions for both 64-bit and 32-bit architectures.
The first thing is to find out What architecture does your system use?To do this, simply open a terminal and run the command:
uname -m
The result will tell you whether you are working with a 64-bit system (x86_64 or similar) or a 32-bit system. With this information you can Download the appropriate package from the official website of the project, where the compressed files for each platform are hosted.
For example, in the case of a 64-bit installation, you could download a package with a command like this:
wget https://freefilesync.org/download/FreeFileSync_10.4_Linux_64-bit.tar.gz
However, if your computer is 32-bit, You would need to use the equivalent package for that architecture, usually with a similar name but indicating 32-bit in the download URL.
Once you have downloaded the compressed file, you just have to Unzip it and locate the executable within the resulting folderWith a double-click on that file, the application will launch and you can start configuring your first synchronizations without complex installations.
Basic usage step by step: from download to first synchronization
Regardless of the operating system, the basic flow for getting started with FreeFileSync follows a fairly similar logic, which makes it much easier. Going from theory to having your first working local backup.
To begin, go to the official downloads page and Choose the version that's right for your system (Windows, macOS, or Linux)Download the installer or the corresponding package and run it following the typical installation steps for your platform.
After opening the program, you will see two main panels: the left one and the right one. In each of them Select the location you want to sync using the folder icon., usually one source and one destination where you want to keep the backup.
You can then define The type of synchronization and comparison options are available in the settings menu.Here you decide if you want a one-way copy, a two-way synchronization, or a mirror update, among other possibilities.
Once you have your folders and options ready, press the button Click "Compare" to have FreeFileSync analyze the differences between the two paths.The result will be a list of proposed files and actions that you can calmly review before executing anything.
If everything is correct, the last step is to click on “Synchronize” so that the planned operations can be carried outDuring the process you will see a progress bar, the number of files processed and any relevant messages, and at the end you will get a report that tells you the result of the task.
To avoid having to repeat the configuration in the future, it is highly recommended that save your project as a profileSo next time, you'll only need to open that profile, tap "Compare," and then "Sync" to effortlessly update your local backup.
With this approach, FreeFileSync becomes a kind of "silent assistant" that It keeps your important data synchronized across disks, folders, and devices.minimizing manual intervention and helping you avoid unnecessary scares when something goes wrong with your main equipment.
All these features, combined with the fact that it's an open-source, cross-platform project that's constantly being improved, make FreeFileSync One of the most complete and practical solutions for managing synchronization and local backups on a daily basisWhether you're a home user with lots of photos or you work on professional projects that you can't afford to lose.