There is a lot of recovery software around, mostly stuff you pay for, but many of them have cost-free versions that let you see what they could recover before you need to buy the "real" version. For Linux and Windows and probably other OS too..and if it's really valuable data you could hire an expert to dig the files out if possible. That's really expensive, but then again, backups may be more valuable than money (why else would you take them?)
Usually, though, the recovery software works on broken filesystems and not corrupted packages. But you could try some..it doesn't harm to download a recovery program or two and see what they could do.
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