How far back can replays go?

I tried viewing my first game from PA Stats, but it said "failed to start replay"

Is this because there are units from that time which are no longer present in the game?

http://www.pastats.com/chart?gameId=76113

PS. Looks like everyone is born a turtle.

It's not just that. Main reason it's because Uber don't store every replay on easy to access storage, but put old files into archive. E.g basically they copy them from S3 to Glacier.

When they first came out farthest back I could go was Gamma Build: 62443

From what I understood replays become unavailable after 3 month
Forgot why I think that though. A function to really "download" the replay files to secure them would be cool I guess.

Yeahh they move replays older than 90 days to a cold storage. Alias it can only be accessed by uber themselves. This is because it costs a lot to keep all those replays available since they have to pay for a lot of mostly unused storage.