Normally yes if you use Windows tools to copy. The major issue is you never know when they aren't copied and if you don't like how it performs they are more difficult to remove.
Originally Posted by Lao Pan
I decided against doing this natively in witeTime since the only value to a ADS is that it is hidden to explorer and you don't have to copy two files. The only program that uses it is NextPVR and NextPVR won't show them anyway, but normally other programs like MPC HD won't display them either because it is not a valid media type. If copying two files is the issue run writeTime on the HTPC
A batch file like this could do what you wanted
how would you save the new timing.info to ADS?
\path to\writeTime %1
if not exist "%~1.Timing.Info" goto nextstep
more "%~1.Timing.Info" > "%~1:Timing.Info"