Deleted File Recovery
Beyond Compare does not provide an undo command for file operations (Copy, Move, Delete, etc) in the Folder Compare or Folder Sync. There are several options to recover files accidentally deleted with Beyond Compare.
Operating System's File Recovery
Windows
If Use recycle bin if possible was checked in the delete confirmation dialog, open the Recycle Bin. Right click on a deleted file and select Restore.
macOS
If Move to trash if possible was checked in the delete confirmation dialog, open Trash. Right click on a deleted file and select Put Back.
Deleted File Recovery Software
Windows
macOS
Deleted File Recovery Services
For very important files, consider using a paid data recovery service, such as: