For data (not programme) files, have a look at Freefilesynch Link
Or Synch toy . there are settings for various options. I use it to make frequent mirror copies of all my Data folder, including Outlook, to a second drive.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.