secure deletion of archived logs

with Oracle we use "backup archivelog all delete all input".
this is a kind of atomic transaction.
everything backuped for sure is deleted.

with Postgres we archive to a local host directory
we do a Networker backup of this directory afterwards and delete the archived logs
but this is not an atomic transaction
so there is a small risk that something gets deleted which is not backuped

how to you prevent this?

Is there any backup tool which can do backups analogous Oracle?