The maxim of backing up is "Only backup files you can't afford to lose." The way to achieve this is by creating daily, multiple unattended and redundant, back ups. There are lots of books and articles out there about back-ups, but they generally all preach the same 3-2-1 strategy. Create 3 minimum copies of each file; keep 2 copies onsite, and 1 copy offsite. Here's a link to a good article on the 3-2-1 approach from Backblaze, a well-regarded online backup solution: https://www.backblaze.com/blog/the-3-2-1-backup-strategy/ Another excellent resource is the booklet, Take Control of Backing Up Your Mac, by Joe Kissell. Lots of great advice here even if you're on Windows: https://www.takecontrolbooks.com/backing-up For my own work I run multiple, unattended backups all day and every day via Dropbox, Backblaze, Time Machine, and SuperDuper! (from Shirt Pocket Software). Each solution fills a specific need. Since adopting this formula many years ago, I've never accidentally lost a file that could not be recovered. Conventional wisdom says that it's not a question of if your hard drive will fail, but when. My growing collection of over a dozen dead external drives attests to this fact. Fortunately, when this happens I no longer panic, due to my system of automatic and redundant back ups.
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