Fix Cloud Sync Case Sensitivity Conflicts — Resolve Duplicate Files with RcloneView
"Report.pdf" and "report.pdf" look identical to Windows and macOS but are two different files to most cloud storage — a mismatch that quietly fills folders with duplicates until a sync job is built to catch it.
Windows and macOS format local drives as case-insensitive by default, so Invoice.pdf and invoice.pdf are treated as the same file on disk. Google Drive, Dropbox, Amazon S3, and most other cloud backends are case-sensitive, meaning they happily store both as separate objects. The result is folders that slowly accumulate near-duplicate files, sync jobs that seem to "create" copies out of nowhere, or overwrite loops where a rename on one device never quite matches the version already sitting in the cloud. RcloneView won't change how the underlying filesystems behave, but it gives you the visibility and controls to catch these conflicts before they turn into a mess.
Manage & Sync All Clouds in One Place
RcloneView is a cross-platform GUI for rclone. Compare folders, transfer or sync files, and automate multi-cloud workflows with a clean, visual interface.
- One-click jobs: Copy · Sync · Compare
- Schedulers & history for reliable automation
- Works with Google Drive, OneDrive, Dropbox, S3, WebDAV, SFTP and more
Free core features. Plus automations available.
Spotting Case Conflicts with Folder Compare
The fastest way to confirm you're dealing with a case sensitivity issue rather than a genuine sync failure is to run Folder Compare between the local folder and the cloud destination. Files that only differ by capitalization show up as separate entries on each side rather than matching as "same," which is the telltale sign — a real duplicate-content issue shows different sizes, while a pure case mismatch often shows two entries with identical size but different names. The "Show different files" and "Show left-only / right-only" filters in the comparison view make these pairs easy to isolate instead of scrolling through an entire folder tree manually.
Preventing Overwrite Loops with One-Way Sync and Checksums
Bidirectional sync (Beta) is where case conflicts do the most damage, since each side can interpret a renamed file as both a new upload and a stale deletion. Switching the affected job to one-way "Modifying destination only" sync removes that ambiguity — one side is always authoritative, so a case-only rename on the source simply updates the destination instead of triggering a duplicate. Enabling the checksum comparison option in Step 2 of the sync wizard also helps, since it compares files by hash and size rather than relying on filename matching alone, which reduces false positives when case differences are mixed with genuine content changes. RcloneView mounts AND syncs 90+ providers from one window, on Windows, macOS, and Linux, which makes it easier to spot when a conflict originated from a specific device's filesystem behavior.
Cleaning Up Existing Duplicates Safely
Once you've identified case-duplicate pairs through Folder Compare, always run a Dry Run before deleting anything — it lists exactly which files would be removed without making changes, which matters when two "duplicate" files might actually have diverged in content since the case mismatch first occurred. After confirming the dry run output looks correct, use the Delete action in the comparison view to remove the stale copy, keeping the version with the correct, current filename.
Getting Started
- Download RcloneView from rcloneview.com.
- Run Folder Compare between the affected local folder and its cloud destination.
- Filter for files that appear as separate entries but share the same size to isolate case conflicts.
- Switch the sync job to one-way with checksum comparison enabled, then Dry Run before cleaning up duplicates.
A little visibility turns an invisible filesystem quirk into a problem you can actually fix, instead of one that just keeps quietly duplicating files.
Related Guides:
- Fix Filename Special Characters — Resolve Cloud Sync Issues with RcloneView
- Fix Cloud Sync Duplicate Files — How to Resolve with RcloneView
- Dry Run — Preview Cloud Sync Before Transfer in RcloneView
Supported Cloud Providers
