The actual Lotus Quickr services for Websphere portal allows backup of places following this IBM Technote.
I am not satisfied by this solution also because the "Administrator" has to do manual stuff for do backup and archive of user places. The Quickr services for Lotus Domino could be fully backuped by a TSM server ( by example) every day withouth any user action.
The goal could be to provide a more efficient backup system something like export >> backup and restore even the user make a mistake and by example deletes a single file inside a library.
Versioning for sure helps, but i am sure that i am not the only one that is searching for something like this.