Fylentra.
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FOLDER BACKUP & SYNC FOR WINDOWS

Your files, backed up.
Every overwrite reversible.

Back up folders to an external drive or Google Drive for desktop, or keep two folders in sync. Fylentra shows what will change, keeps the previous version of every file it replaces or deletes, and stops automatic runs when something looks wrong.

Download for Windows See how it works

v0.9.0 · Windows 64-bit · Experimental release

FYLENTRA 0.9.0
Preview changes All your jobs Clear next steps Built-in Help
Fylentra 0.9.0 in English showing a folder comparison with new files for the Backup folder. Sample folders.

Compare both folders. Review the changes before applying them.

Actual app · Sample folders
One-way or two-way Version history Content verification NTFS & exFAT

LESS GUESSWORK

Know what changes.
And what you keep.

A clear preview before you sync. A useful history afterward. And a simple overview of every job.

01 / PREVIEW

Before anything changes

See new, updated and deleted files before a manual sync. When something needs attention, get a clear explanation and the next step.

02 / HISTORY

Keep an earlier version

Previous versions are kept before supported replacements and deletions, for as long as you choose. Reveal recorded files in Explorer or inspect available versions in Recovery center.

03 / JOBS & SCHEDULES

Every job, in view

See your last successful sync and the next scheduled run. Filter the jobs that need you. Schedules keep running from the tray while your computer is awake.

FROM SOURCE TO BACKUP

Two folders.
Three simple steps.

You choose the folders.
Fylentra compares their contents.

  1. 01

    Choose your folders

    Set a source and a destination. Choose one-way backup or two-way sync.

  2. 02

    Review the preview

    Analyze your folders, review the differences and resolve any conflicts.

  3. 03

    Apply the changes

    Confirm the sync. The contents of copied files are verified using SHA-256.

Explore backup and sync
Fylentra
Illustrative preview
MY TASK

Project files

3 changes
My computerProject / Files
External driveBackup / Project
FileAction
Presentation.pdfNew copy
Budget.xlsxUpdate
Notes.txtNew copy
Changes are ready for your reviewPreview

Backup: files are copied from the source to the destination.

FYLENTRA 0.9.0

A good place
to start.

Set up your first pair of folders. Start with a preview, then sync when you are ready.

Download for Windows 64-bit

v0.9.0 · 112 MB · September 28, 2026

Windows 10 or 11, 64-bit. Tested on Windows 11.

English by default. Switch to Greek in App settings.

SHA-256 checksum

WHO MAKES FYLENTRA

Built in Athens by GIM Agency.

Fylentra is made by GIM Agency, a digital agency in Athens, Greece, working with businesses since 2009. We built it because we wanted backups we could check before they change anything.

  • Free during the beta.
  • No account, no ads, no tracking.
  • English and Greek, in the app and in support.

Questions, problems or ideas? Write to info@gimagency.gr

GOOD TO KNOW

A few answers
before you start.

Backup or two-way sync?

One-way backup transfers changes from the source to the destination. Two-way sync checks for changes on both sides. The preview shows the proposed actions before each manual run.

Can I use an external drive?

Local NTFS and exFAT folders are supported; version 0.8.1 was tested on a physical exFAT drive. Version 0.8.9 also checks folder recognition using synthetic folders on Google Drive. This does not validate every cloud-drive condition. FAT32 remains unvalidated. UNC network paths are not supported.

Where are my files stored?

Your files stay in the folders and on the drives you choose. Sync runs locally. Earlier versions are kept in .foldertwin-history. Optional update checks contact fylentra.com for version information; they do not send your jobs or files.

What if a task is interrupted?

Completed changes may remain after an interruption. Check History or Recovery center before continuing. Select a file name to reveal it in Explorer; deleted files open their nearest available folder. Recovery does not automatically undo every change.

Why did Fylentra ask me to confirm the same folders again?

Virtual drives can change a folder's internal identity when they reconnect. Explicit folder confirmation saves an identifier at each location. When the identifier matches at the same location, an automatic schedule continues after fresh verification. Missing identifiers or moved locations still require confirmation. The identifier recognizes folder continuity, not a particular physical disk.

Where can I find help inside the app?

Open Help from the sidebar or press F1. Search the FAQs and troubleshooting topics in English or Greek, without an internet connection. Messages that need attention also link to the relevant help topic.

Why does my job ask for review every day?

Choose automatic mode in Scheduling for unattended backups. Automatic runs still stop for conflicts, suspicious or mass changes, unrecognized folders, interrupted operations and incomplete saves, and each stop shows its reason. Preview mode asks for your approval on every run that changes files.

Does Fylentra need to keep a window open?

No. With Close to tray enabled, closing the window releases its memory while scheduled backups and notifications continue. Opening Fylentra again loads your saved jobs; unsaved preview choices need a fresh analysis. The computer must be awake and the app must remain running in the tray. Choosing Quit stops scheduling.