f.y.i. The Western Digital Acronis TrueImage WD Edition 2010 (build 14,010) was released just recently. I found it and installed it on WinXP/Vista/Win7 [triple boot PC] 14 October 2010.
Two backups and one restore from within XP SP3 seems to have no issues. I shall try same backup/restore process within Vista and Win7 later, to verify full functionality in all three OS's.