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#11
I use Macrium imaging to backup both my system and my data partitions. Given that you have apparently a lot more data than I have, you may have to modify the approach somehow. But the main thing is that I provide for an image trail all the way back to the initial installation and I image daily. Prerequisite with my approach is that you have enough disk space to hold one weeks worth of backups plus the weekly and monthly copies. The space requirements can be reduced if you use incrementals, but for that you need Macrium Pro or an equivalent other imaging program.
The backup time is not so important because the imaging can run in the background and does not keep me from doing other tasks. Here are the details:
I make a daily image of my system and data partitions at boot-up. I have set Macrium to do that automatically. It takes only 9 minutes from my SSD to the internal HDD. Every Sunday, I copy the Sunday image to an on-line external disk into a "weekly folder". Every first of the month I also copy the last image to an external disk "monthly folder" that usually stays off-line. That way I have a whole history all the way back to the initial installation.
In addition I have two 16GB sticks to which I copy my data every 3 months and put it into my bank safe. 3 months later I retrieve the first stick and deposit the latest data copy on the second stick, and so on.