[j-nsp] M20 redundancy config?

[billp]

After looking through all the docs and notes, I have come up with
the following config to enable reduncancy on an M20 (installed
dual RE and dual SSB):

chassis {
    redundancy {
        routing-engine 0 master;
        routing-engine 1 backup;
        ssb 0 preferred;
        failover on-loss-of-keepalives;
    }
}

I also use "commit sync" when committing configs, and try and
do a "request system snapshot" on both RE's individually, 
occasionally.

Question is- is this the proper configuration and operational
way to ensure redundancy in case of an RE or SSB failure?

Is there a better 'best practice'?

Any input appreciated.  Any other ideas/methods to increase
reliability/failover/etc would also be appreciated.

thanks
bill