I’d recommend a full battery calibration before running the command one more time, if you haven’t already (charge the battery fully, leave it on the charger at 100% for a while, then fully discharge until it shuts itself off, leave it for a bit, then fully recharge while off). If the calibrated values line up with a full:design ratio of ~80%, especially with a 10-year-old battery with almost 700 cycles on it, my take is that’s pretty great.
That said, I think the best way to get an accurate feel for the health of an old battery is to put it through one full cycle of normal use and time how long it takes to die.
When it comes to privacy and security, I think you should treat all cloud providers equally. Use a client with client-side encryption so that the only thing that touches the provider is encrypted data.
Rclone is an example of a good client that can do this, and can even mount your cloud storage as a filesystem with its encryption layer in between.