[Vt71fcAqt7]

Right but this doesn't necessarily have to be a drive failure. (Pun not intended.) Imagine if there was some id collision due to a db migration or something, and then one user ends up deleting the other user's data accross all backups. Unless google never deletes any data, even when the user deletes it themselves, then you can't be saved from that.

[ss1996]

Theoretically possible, but (super super super) unlikely. I'd also think that when a user "permanently" deletes their data, it would still be on Google servers for a specified time (maybe a week?).

Again, all guesses. But if someone offered me a bet, I'd wager 1:10,000 that the data is permanently deleted. Extremely unlikely.

[londons_explore]

30 days has become the industry wide standard for keeping data explicitly deleted by a user.