I ran a large backup today (19,818 files and 1,773 folders) to a portable USB hard drive and got a warning message on 4 of the files. Here is the Backup Log for one of them:
[11/17/2012 4:06:53 PM] Warning: Skipping file C:\Program Files\Eudora\spool\lmos.dat.002
Source error (code 87). The parameter is incorrect. (C:\Program Files\Eudora\spool\lmos.dat.002).
The other three warnings were similar.
The Log at the ends says that 4 files were skipped. Windows Explorer does show those files on the hard drive but with size 0 bytes.
I reran the backup and the 4 files were successfully copied!
So what's going on?