FreeFileSync Open Source File Synchronization

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FreeFileSync User Manual:

Variable Drive Letters

USB memory sticks or external hard disks often get different drive letters assigned when plugged into distinct computers. FreeFileSync offers two solutions to handle this problem:

Option 1: Specify a folder path by using a unique volume name:
Enter the path as [volume name]\folder instead of using a specific drive letter.
 
For example, if the name of the USB stick in drive E:\ is "Backup-Disk", you can replace a path like E:\Documents with [Backup-Disk]\Documents.
 
Note
Drive letter by volume name It is not required to look up and enter the volume name manually. Just select the corresponding entry in the drop down menu.

Option 2: Use a relative directory name:

  • Use \Documents instead of E:\Documents
  • Save and copy synchronization settings to the USB stick: E:\Backup.ffs_gui
  • Start FreeFileSync by double-clicking on E:\Backup.ffs_gui
 
The working directory is then automatically set to E:\ by the operating system so that the relative path \Documents will be resolved as E:\Documents during synchronization.