rm upgrade from 5.2.3 to 5.3.1

As I see in Admin Guide I need to upgrade rm to 530 and then to 531 if I am on 523.

I need to back up serverdb\backup dir, but in Admin guide is:

                        The store subdirectory is not backed up or restored by any

                               Replication Manager utility. Use your backup software to explicitly

                                schedule a backup of the store subdirectory, and to perform a

                       restore, if necessary.

                        So should I backup and serverdb\store? It is 1,5 GB big and have dir for every month.

                        Should I keep old dirs, or could I delete them? Is there something else to backup to be safe?

On aix clients I installed 52, then 523 and then 5.2.0.3.0.HF_URM00068470_R4_PRELIM. Is the upgrade path the same like server? Upgrade to 53 then to 531?

Is upgrade of Solution Enabler nondisruptive to ( to 7.2 ) ? We are currently on 7.1.1.18.

     On download site there are only this version of Solution enabler:

Solutions Enabler 7.2 – 32-bit only Supported With ControlCenter

But I will not use this se with ControlCenter. Where can I find wersion of se for use only with Replication manager server and clients.

Regards