I am administering several Debian squeeze servers in production. They have stock mysql-server-5.1 installed (5.1.66-0+squeeze1). I also fetch the latest percona tools from
deb http://repo.percona.com/apt squeeze main
Apparently after last update to package percona-xtrabackup 2.1.3-608.squeeze the package lost /usr/bin/xtrabackup_51 which was compatible with default MySQL installation on Debian squeeze.
Would it be possible to provide percona-xtrabackup-2.0 package with version compatible with mysql-server-5.1? I bet it would be useful to many users of Debian squeeze.