@LadyKate - quite a few folks here use Free File Synch in mirror mode. I use a similar program Goodsynch, at the time of selecting it FFS was in its infancy.
I normally run it at shutdown, takes a few minutes to sync my data drive: Calibre Libraries, Documents, Pictures, Music etc, plus the calibre, Handbrake, Irfanview etc folders in %APPDATA%\ etc.
BR
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