Just a quick note - I have added support for email alerts on failed backups into XtraBackup Manager.
Now if something goes awry, XtraBackup Manager can optionally send some detailed information to the email address(es) of your choice!
This should allow you to easily hook to SMS gateways, NOC alert lists, etc.
Additionally, we have been doing some preliminary testing of XtraBackup Manager on a Nexenta machine with 8 Xeon CPUs using ZFS with lzjb compression.
We are getting around 3.8x compression and the Gigabit NICs seem to be the bottleneck in the speed here. Both CPU and disk utilisation look very low.
Our plan is to use a 10 Gigabit NIC in the Nexenta Backup host and stack it with storage - it should make for a very cost effective and space efficient backup host.
Meanwhile, development work continues towards a 1.0 !