Allow me to suggest another freeware alternative: SyncToy 2.1(x64). As old as it is, it still installs and runs fine under Win10. It's a manual sync tool with options that you can set up. I have it configured to 'Echo' left to right, Original location to backup location. The only shortcoming is that you can only select one folder (and its subfolders) for each task, but there is a menu selection to 'Run all Folder Pairs'. For Calibre, I have it configured to backup my Libraries, Calibre User files, Books (where I 'Save to Disk' after entering new books), and Kobo Database Backup (from Kobo Utils).
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