FreeFileSync Guides for Windows
Independent, task-focused instructions for Windows users. Every guide covers one intent so setup, synchronization modes, backup workflows, automation and troubleshooting do not compete with one another.
Getting Started
- How to Install FreeFileSync on Windows 11 — Install FreeFileSync on Windows 11, verify the download, and prepare a safe first comparison.
- How to Install FreeFileSync on Windows 10 — Set up FreeFileSync on Windows 10 and complete the first folder comparison without changing files.
- FreeFileSync First Sync: Beginner Walkthrough — Configure a cautious first synchronization and verify the direction before copying or deleting files.
- FreeFileSync Portable on Windows: Setup Guide — Understand portable availability, profile storage, updates, and safe use on multiple Windows PCs.
- FreeFileSync Interface Explained — Learn the folder selectors, comparison grid, filters, and synchronization controls in the Windows interface.
- How to Compare Two Folders with FreeFileSync — Compare two folders and interpret equal, different, newer, missing, and conflict results before syncing.
- Save and Reuse a FreeFileSync Configuration — Save a reviewed GUI configuration and reuse it without rebuilding every option.
Synchronization Modes
- FreeFileSync Two-Way Sync Explained — Use database-assisted two-way synchronization and understand conflicts, deletions, and first-run behavior.
- FreeFileSync Mirror Sync Explained — Make a target match a source while reviewing deletion risk and direction before every mirror run.
- FreeFileSync Update Sync Explained — Copy new and changed source files without deleting extra items already stored at the destination.
- Configure a Custom Sync in FreeFileSync — Build custom left-to-right and right-to-left rules for a clearly defined file workflow.
- Compare by File Time and Size — Understand timestamp and file-size comparison, tolerance, daylight-saving shifts, and limitations.
- Compare Files by Content in FreeFileSync — Use content comparison when timestamps are unreliable and account for the additional disk-reading cost.
- FreeFileSync and Symbolic Links on Windows — Choose how junctions and symbolic links are handled without creating recursion or unexpected copies.
- Use File Versioning in FreeFileSync — Keep replaced and deleted files in a versioning folder and plan retention outside the live destination.
Backup Workflows
- Back Up Windows to an External Drive — Create a reviewable external-drive backup job with stable drive paths, versioning, and verification.
- Synchronize a USB Drive with FreeFileSync — Synchronize removable storage while avoiding wrong-drive selection and unsafe unplugging.
- Back Up the Windows Documents Folder — Protect personal documents with a repeatable configuration and a separate recovery check.
- Back Up a Photo Library with FreeFileSync — Copy photo libraries while preserving originals, metadata, folder organization, and recovery copies.
- Synchronize Large Files Efficiently — Plan comparisons and transfers for videos, disk images, and other large files without assuming delta copying.
- Synchronize Multiple Folder Pairs — Combine several reviewed folder pairs in one configuration without confusing source and destination roles.
- Exclude Files and Folders with Filters — Write and test inclusion and exclusion filters before applying them to an important synchronization job.
- How to Verify a FreeFileSync Backup — Confirm that a backup is readable and complete through logs, comparison, and sample restore testing.
Storage, NAS and Cloud
- Synchronize Files with a NAS — Use UNC paths or mapped shares and handle credentials, availability, and network interruptions.
- Sync a Windows Network Share — Configure a network-share job and distinguish connection errors from file permission problems.
- Use SFTP with FreeFileSync — Configure an SFTP connection, verify the host, and understand remote timestamp behavior.
- FreeFileSync and Google Drive — Understand supported cloud connections, account authorization, quotas, and safer test runs.
- Synchronize a Local OneDrive Folder — Work with the Windows OneDrive folder while accounting for placeholders and Files On-Demand.
- Synchronize a Local Dropbox Folder — Avoid conflicting sync engines when FreeFileSync and Dropbox both observe the same local files.
- Copy NTFS Permissions with FreeFileSync — Decide when Windows ACL copying is appropriate and test permissions with a non-critical folder first.
- FreeFileSync and Long Windows Paths — Diagnose path-length, naming, filesystem, and destination compatibility problems.
Automation
- Create a FreeFileSync Batch Job — Convert a reviewed GUI configuration into a batch job with controlled error handling and logs.
- Schedule FreeFileSync with Task Scheduler — Run a batch job through Windows Task Scheduler with the correct account, paths, and permissions.
- Set Up RealTimeSync on Windows — Monitor selected folders and trigger a reviewed batch job after changes settle.
- FreeFileSync Command Line on Windows — Start saved configurations from scripts without inventing unsupported command-line switches.
- FreeFileSync Email Notifications Explained — Understand edition availability and configure alerts without exposing account credentials.
- Read FreeFileSync Log Files — Use log files to distinguish successful copies, warnings, skipped items, and failed operations.
- Shut Down Windows After a Sync Job — Add post-sync shutdown only after the job is reliable and failures remain visible.
Troubleshooting
- Fix FreeFileSync Access Denied Errors — Diagnose permissions, locked files, protected folders, and network credentials in a safe order.
- FreeFileSync Cannot Copy Files in Use — Identify applications locking files and choose retry, skip, or application-aware backup methods.
- Fix the Wrong Synchronization Direction — Stop the job, protect remaining copies, and correct source, destination, and sync rules.
- Resolve FreeFileSync Sync Conflicts — Review conflicts rather than overwriting both sides and rebuild the database only when appropriate.
- Fix Network and NAS Connection Errors — Separate DNS, credentials, share availability, VPN, firewall, and file-level problems.
- Why FreeFileSync Is Slow — Check comparison mode, small-file overhead, antivirus scanning, network latency, and destination speed.
- Recover After an Incorrect FreeFileSync Job — Stop further writes, inspect versioning and backups, and avoid actions that overwrite recoverable data.