Well, if this isn't something.... I spent most of the afternoon trying to remember what I used from the old Windows days where I could see folders side by side and compare the versions, etc, with the changes in red. I finally remembered XPTools and from there SyncToy. I set it up and tried it against a test folder and it worked well, although took a long time. So I set it up to sync Calibre Library to Calibre Backup and it ground through over 3K files until it did an excellent backup. I saves the setup so I can run it anytime.
With that success I was puzzled why nobody has responded to my last post here. Now I find that some did but I failed to have it set to notify. And of course BetterRed has posted above and I do need a faster version of SyncToy so I'll take a look at FreeFileSync tomorrow.
I did look at RoboCopy and other command line apps I recalled from my pre-Windows days but I don't want to try and remember how to work them. Getting too old for that stuff I spose.
Thanks for your help and I have fixed the notify to instant so I look for all. Especially if somebody has a C++ sync that will tear through over 20k files in, oh say 1 minute.
