We are looking into using Astaro 5 (V4.737), and have tried performing a restore from version 4.0.21, but Astaro 5 is reporting "Backup Converter is not available yet". Any suggestions?
As of right now... Manual Conversion. It's a real P.I.T.A. but it's the only solution right now. v5-release will have the converter as might later betas, but not just yet.
