I want to have an all-encompassing personal history for the same reasons I want good access and error logs. I want to see when something wrong happens, and I want the means to diagnose the problem and fix the damage.
A few good examples:
- Did I forget to write down any tax-deductible expenses?
- What is my net worth? Is my current lifestyle sustainable?
- Which parts of my city have I yet to explore?
- Can I search all my conversation with John across 3 messaging apps, email, SMS and phone?
I took a few jabs at these problems. Invariably, the services I consumed data from shut down their API or hid my data better. In some cases, I wanted to use a different service, but didn't feel like updating my scripts.
I'm currently looking into this again, but this time it's also a matter of privacy. I want to own all that data I create. I'd rather integrate tools under my control than services who actively try to hold my data hostage.