i just keep a usb stick for sensitive data, plug it in....do your work...plug it out....but i am a simple company!!!!!kopie and past every month....What I keep on iCloud etc is only of concern for me if I lose it. There is nothing sensitive. It appears that because they share Bluetooth a deletion on one means the same happens on all devices etc. I tried deleting on one device whilst Bluetooth was off but when I switched back on the file was deleted on the others! Odd that it should do that instead of updating and reloading the image.
I use a constantly varying VPN which can be a bit of a bind as I am repeatedly warned about access from strange places but, it is a small price to pay for keeping the ne’er do wells at bay.