Hi,
any known problems restoring older 9-settings-backups (ocb-files) to 10?
I personally had zero problems from my 9 complete backup file. 10 took it all and gave me my entire config back. So far, nothing is missing that I've found.
Thx! 
Loading an Opus 9 config into Opus 10 is the same as installing 10 over 9. Both are designed to work and the new version should be able to understand the old config without problems.
You may run into issues trying to put a 10 config into 9, however. (It might work, but no guarantees.) So if you want to try the new version but think you might want to go back to the old one, do a config backup and keep it safe somewhere.
Perfect!