If you need Xtrabackup for Solaris 10 and 11 (x64), you can download it from the link on the following page:
Fwiw, we needed this for a server, and it’s not a standard package available for download, so I just wanted to make this available to all.
(Sorry if you’ve read this for a third time, and for the double link – I think the planet mysql feed might reject posts with direct ftp links.)
Hope this helps.