Bah nevermind I'll code that in the plugin.
I'll add a list of files to backup.
If the backup fails they will stay in the list and I'll have a thread that will regularly try again to backup.
That's the best way to do it I think.
Now about xp_leto. It should be easy to integrate it no problem.
How would this work ?
I suppose I should add another parameter (name of script or script command) that will end-up at the end of the vaultster parameters and then use this extra parameter with leto before uploading to the destination server (be it the backup vault or another server).