How long does a back up keep back ups?

Sorry if this is the wrong section to post this question, but I don't think there was section specializing in this type of question. I need to restore my forum from a back up. The catch is that the back up I need is the End of Febuary/Beginning of March 2011 back up. Are back ups deleted after they are a certain age? Is there a way a for me to find this back up somehow?

I already tried using the utilities to restore the forum as far back as possible, but the earliest available to me was November 2011. Is there any possible way to access this early back up?
Thanks.

Hello,

Backs up should run every 24 hours or so. Sometimes this is not the case because there wasn't any change done or any process on the forum. If you ever need a backup, you can also request it.

Thanks for the reply. My forum has been very inactive other than for occasional old member logins for the past year or so. I deleted a few forum sections during March of 2011, but realize now that I need the things I deleted back. Could you direct me to how to request a back up from Early March 2011?

I don't believe you can back up that long.

Alright, thanks for your help anyways.