If you want to keep something truly secure you don't put it on a computer. Computers are not for secrets.. Paper is better: handwritten is best. Things you don't need to worry about getting stolen -- the sermon notes you took, knowing that the sermon is going to be up in a fortnight on the church website anyway -- sure.
Setting up a discoverable email trail to defend yourself: certainly.
But you don't use a computer for research, intellectual property, love letters, condloences, or letters of regret.
That is what cards, paper, and legible handwriting is for.
I use a diary. amd suggest you do also. Do not trust commecrial smart watches or andriod phones. Google has a track record, enough to have Forbers -- that journal for the bakkers-- note:
It comes down to who you trust. In an age of privacy scandals that only seem to multiply, you have to be very cautious. Without putting on a tin foil hat, it makes sense to look at alternatives when purchasing a smartwatch. I'm not getting them until sensors that I would need on exteme walks are reliable. Besides, the best fitness applications for athletes monitor for overtraining, not quantity. That is what a notebook is for -- and I still have my training notebooks from when I was competative. I can't read an eight inch floppy disk from that era. .
After all, Google, like Facebook, bases its entire business model around your information. In contrast, Apple has been adding multiple privacy controls in its latest operating system iOS 13 as it tries to cement its place as the firm that cares about your privacy.
The Apple Watch is a good option, but it’s expensive–easily a few hundred dollars more than a Fitbit. Even so, if you can afford it, I’d certainly recommend the Apple Watch: it’s worth the price for the gains in data privacy.
Most of the time, you don't need that smartwatch. If you want something accurate, get a solar charged analogue watch, if manual, a Seiko 5.
And Apple watches and phones are more secure -- but that relies on security by obscurity and closed source A notekbook in a locked safe cannot be accessed by the internet.
Note that Google's model is to sell advertisements, and they now have much of the web optimised for them.
If your employer wants to keep data safe, let him get you a phone and use it only for work. Keep your own (digital) life somewhere else. And kill your facebook and twiter accounts. Do not have smart appliances you can avoid.