In the above question, an answer states:
> It's not possible to restore plan within Bamboo, but you have disk/DB backup it's possible
How can I restore a plan given that I have a full disk backup?
If you have a backup of both database and bamboo-home, you may install the same version (from bamboo archive) and recover the skeleton of the plan by exporting as Java Specs and use it to import onto your current setup. Unfortunately, you cannot preserve the build history.
This is what is suggested in this feature request as well: BAM-1223
Hope that helps.