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This is part of the "PROTECT TO THE CLOUD" enhancement wishlist, which was confirmed as *not* part of any plans through 2019.
At some point in the past, this was the strategy. It even exists in whitepapers from IBM. Many are gone in the great cleanup; however this one remains until someone edits or deletes it:
http://www-01.ibm.com/support/docview.wss?uid=swg22003019
"If a deduplicated extent is marked as damaged, IBM Spectrum Protect can take steps to repair that extent, for example, by bringing it back from a replicated copy if the PROTECT STORAGEPOOL or REPLICATE NODE commands are used."
Dawson also was under the impression this was the functionality, and we started down the path of finding out why it was not happening. Once it was found to not be the case, it quickly changed to "Make an RFE and vote on it."
Colvig (ex) thought this was omitted due to cloud cost concerns, but the decision happened long before object storage was being designed.
Ayres (L2) thought this was omitted due to concerns of having data multiple-reingested, but that is no different of a concern than with multiple parallel backups of any type.
Thompson (STSS) believes that a multi-week outage and a complex, manual procedure is a "performance" issue and not a functional issue. No running environment would accept that justification.
Thompson also reported that PROTECT STG to VTL would be a good option, which is also not supported due to all of the limits on PROT STG.
I feel this RFE is something that needs higher priority than "long term goals". This should have happened before PROTECT STG.
This request may not be delivered within the release currently under development, but the theme is aligned with the current multi-year strategy. IBM may consider and evaluate any RFE Community feedback for this request through activities such as voting. IBM will update this request in the future.
There is no way that customers coming from VTL environments where damaged objects on a volume can be dealt with automatically are going to accept IBM Spectrum Protect Directory Container pools as an adequate replacement with this defect in place. Yes this is a defect and needs to be fixed via patching as soon as possible.