Notes on Fast File Resync (FFR) and the files to be restored
Note the following:
The original files must be present on the client and are overwritten by the restore.
The names and creation times of the original files and the snapshot files must be identical.
Files must be larger than 20 MB and be formatted in NTFS.
Files must not be compressed or encrypted.
There must be no open handles on either the original file or the snapshot file.