On the matter of browsers with High Sierra, there is the rare occasion where a site doesn¡¯t like Safari, and in those cases I¡¯ve used Chrome or Firefox. ?I don¡¯t recall how I found Chrome, but it would have been a web search for Chrome on High Sierra.
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On backups, I¡¯ve had the odd hiccup with Time Machine, and so, now and then, do a straight copy of documents onto an external drive. ? That has worked going back to the Atari 520.