Professional game development companies usually make backup copies, physical backup copies, of all their data multiple times every day. Even if the main computer where it was hosted was completely fried beyond repair, they wouldn't lose any progress on their development.
I'd be extremely surprised if they didn't do offsite backups as that's just been a standard thing for decades. The first company I worked for way back did daily backups and sent copies offsite on at least a weekly basis.
