I'd say this is quite a complex story, but I try to keep it simple. A while ago, I switched to v12 from v11. So far so good, but during upgrade of the enterprise manager I hit a failure and the installation aborted. Even worser, the installation has broken the EM, I wasn't able to run the old one and upgrade was also not possible.
So I created a case (#06050877) and finally we were able to upgrade using a backed up instance. What support then had mentioned was some inconsistency regarding keysets.
Due to lack of time I closed the case and wannted to test the situation later. I though that if I use a fresh B&R instance, I could test if the EM was able to provide me a recovery key for an old backup. But a fresh instance does report "there is no EM connection", hence I cannot use the "lost password" option. Playing around with the current instance also looks dangerous to me as removing and re-importing had caused many issues in the past and I don't wannt do have it ever again.know possible issues with keysets after VBR DB migrations when something went wrong with it and we get "keyset is not valid" in EM log files after the VBR DB migration
So somehow I would love to have a way to verify if keysets for older backups are still existent. Any idea how I might be able to do that?