Plug a USB drive or SD card into your phone and back up whole folders to it in one tap. OTG Sync lists every folder
on your phone; pick what happens to each one, press Sync Now, and it copies or moves the files onto the
drive, keeping the same folder structure. It started as a way to merge a drawer of old phones into one 2 TB drive.
How it works
1. Pick a target Choose the USB drive or SD card to sync to.
2. Set each folderNo Action, Keep & Sync or Sync & Remove, with a file count next to every folder.
3. Sync Now Watch overall progress and each file as it copies. Abort any time.
4. Review A summary lists every file that was synced, removed, skipped or in conflict.
Features
Keep & Sync Copies files to the drive and leaves the originals alone. Safe for backups.
Sync & Remove Moves files to the drive and deletes the originals only after each one is copied — a quick way to free up space.
Deletion warning Before anything is removed, the app lists the folders affected and asks you to confirm.
No overwrites Files already on the drive are skipped, and files that differ are reported as conflicts instead of being replaced.
Hidden folders Show and sync hidden files and folders when you need them.
Folder by folder Every folder has its own setting; a parent folder does not change its subfolders.
Built-in help A sync guide on start and a guided tour, both easy to turn off. Light or dark theme.
