See Bug 9130 for details..upgrading from a SME8.2 to SME9.0
The differences between the SME8.2 dar and libdar versions compared to SME9.0 appears to be the cause of this issue, smeupdates-testing currently has new rpms waiting for release.
SME9.1RC1 has the latest versions so is not susceptible
So if you have a sme8.1 system updating to sme8.2 prior to doing a upgrade will be problematic if going to sme9.0 using the backup/Restore functions from the server-manager. Please NOTE this only affects the soon to be obsoleted SME9.0....
Upgrade to a SME9.1RC1 system is unaffected
Backups from the console are different and would appear to be OK from my testing to date