It is a similar story to "Not your keys, not your coins".
You try to backup your wallet, save your keys, your wallet seeds but unfortunately you ended by storing it in Google Drive or OneDrive which you don't actually control. What if Google Drive or OneDrive have serious data leak, hacks, etc.
Why do you not trust exchanges but trust Google or Microsoft which are centralized corporations too?
If you want to save your backup, save it offline, in a vault which is against fire, water, pressure ...
You can write your key / seed down and store it offline, safely and secretly.