if any one of my Windows or Android units got stolen and somehow cracked into or something.
This shouldn’t be a concern if you’re using disk encryption and secure passwords, which is generally the default behaviour on most systems these days.
On Android, you don’t need to worry about anything as long as you’ve got a pin/password configured, as disk encryption has been enabled by default for like a decade now.
On Windows, if you’re on the Pro/Enterprise edition, you can use Bitlocker, but if you’re on Home, you can use “device encryption” (which is like a lightweight Bitlocker) - but that requires a TPM chip and your Windows user account linked to a Microsoft account. If that is not an option, you could use VeraCrypt instead, which is an opensource disk encryption tool. Another option, if you’re on a laptop, could be Opal encryption (aka TCG Opal SED), assuming your drive/BIOS supports it.
TL;DR: Encrypt yo’ shit, and you don’t need to worry about your data if your device gets stolen.