I have around 100 GB of data on my computer HDD, plus around 2 TB of data on external hard drives. All of that gets backed up incrementally to an external 3 TB HDD once a fortnight. The files on my computer undergo changes more often, almost on a daily basis, hence that data is set to additional real-time sync with my OneDrive account. Every now and then I will mount the backed up images on the 3 TB HDD to test for possible corruption.
Wireless external drives are too expensive, and when they do become affordable for me, I will switch over to them so that I can set up continuous real time local backing up of all my data.
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