I've just upgrade to 7.5 sp1 : nothing really new.
Maybe one thing (I forgot if it was available on previous version) : you can now see local and network folder size on console history tab. As we use dedup, I don't know if it is really relevant, but it may be a good start.
About backlog or backup queue on agent : N O T H I N G
It means that you never know if your data are safe or not.
It's amazing for a backup and security software to claim backup success and let the data un protected on client machines.
BTW : support is not able to help... No solution ?!