[sheenobu]

I think I know specifically what you are talking about. The actual files an engineer could upload to populate their folder was not multi-region for a long time. The servers were, because they were stateless and that was easy to multi-region, but the actual data wasn't until we replaced the storage service.

[jesboat]

I think the storage was replicated by 2013? Definitely by 2014. It didn't have automated failover, but failover could be done, and was done during the relevant drills for some time.

I think it only stopped when the storage services got to the "deprecated, and we're not bothering to do a failover because dependent teams who care should just use something else, because this one is being shut down any year now". (I don't agree with that decision, obviously ;) but I do have sympathy for the team stuck running a condemned service. Sigh.)

After stuff was migrated to the new storage service (probably somewhere in the 2017-2019 range but I have no idea when), I have no idea how DR/failover worked.

[sheenobu]

Thank you for the sympathy. If we are talking about the same product then it was most likely backed by 3 different storage services over its lifespan, 2013/2014 was a third party product that had some replication/fail-over baked in, 2016-2019 on my team with no failover plans due to "deprecated, dont bother putting anything important here", then 2019 onward with "fully replicated and automatic failover capable and also less cost-per-GB to replicate but less flexible for the existing use cases".