It  depends on the scale of your portfolio but if you have a couple properties and they’re all straightforward, I think google drive is fine. 

It takes a few days for the money to hit my account, but that is a small thing compared to the convenience.

Negotiating with the seller was straightforward, leveraging the property's condition to secure a $50,000 purchase price.

Since these are high yield DEBT deals at 60% LTV or less on commercial property it’s a RELATIVELY low risk compared to value added or new build equity participations.  

Document the time you spent on the property compared to others, especially if you’re trying to qualify under the “100 hours and more than anyone else” test.

If you don't have that, keep earning, saving, and managing the risk you take by investing in REITs (which is small but risk still exists).If you already have at least $100k to invest, and you're wondering where to start as an OOS investor, I recommend this dataset that we at BiggerPockets put together specifically for people like you and me.https://www.biggerpockets.com/resources/housing-market-data/...It contains information like job growth, population growth, and rent-price ratio for all markets to compare and contrast.

Leverage magnifies return. 3) The effort involved in adding an ADU is comparable or larger than a rehab associated with a BRRRR.

Have you compared the appreciating cash flow on the duplex to the potential savings on your current mortgage over 1,3, and 5 years? 

For my first house hack, it was actually pretty straight forward. 

It’s pretty straightforward with a lot of features but there is a learning curve.