[AnotherCat]

I used SyncToy from its beginning through to sometime after the last (now very dated) version. In more recent times I have used FreeFileSync which is very robust and in my view much easier to use and set up.

SyncToy suffered from a number of problems and as far as I know, for example, errors and redundant backing up of files due to daylight savings time changes were never fixed nor ever formally described (SyncToy was never a formal Microsoft product and so was never supported). I would be very wary using it especially if syncing both NTFS and FAT Drives as NTFS time is UT format and FAT is local time (FreeFileSync, for example, specifically provides for sync'ing these).

FreeFileSync is rigorous in its handling of such issues, others use different syncing applications and I suspect they may be just as good and maybe better but I have had no need to try them.