>> Вот мне интересно, вот создали вы снапшот, а может и сотни снапшотов и как узнать что это за снапшоты, чего они снапшотят.
> Так же, как и в ZFS.

% zfs diff roxy/usr/local@201208261212 roxy/usr/local
M    /usr/local/bin
M    /usr/local/etc
M    /usr/local/include
M    /usr/local/info
M    /usr/local/lib
M    /usr/local/libdata/ldconfig
M    /usr/local/man/man1
M    /usr/local/man/man5
M    /usr/local/sbin
M    /usr/local/share
M    /usr/local/share/aclocal
M    /usr/local/share/doc
M    /usr/local/share/examples
M    /usr/local/info/dir
M    /usr/local/share/licenses
M    /usr/local/lib/perl5/site_perl/5.12.4
M    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto
M    /usr/local/lib/perl5/5.12.4/man/man3
-    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla
-    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA
-    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA.pm
-    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA/cacert.pem
-    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla
-    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla/CA
-    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla/CA/.packlist
-    /usr/local/lib/perl5/5.12.4/man/man3/Mozilla::CA.3.gz
-    /usr/local/lib/libgcrypt.so.18
-    /usr/local/lib/libgcrypt.so
-    /usr/local/lib/libgcrypt.la
-    /usr/local/lib/libgcrypt.a
-    /usr/local/bin/dumpsexp
-    /usr/local/bin/hmac256
-    /usr/local/bin/libgcrypt-config
-    /usr/local/include/gcrypt.h
-    /usr/local/include/gcrypt-module.h
-    /usr/local/share/aclocal/libgcrypt.m4
-    /usr/local/info/gcrypt.info
-    /usr/local/share/licenses/libgcrypt-1.5.0
-    /usr/local/share/licenses/libgcrypt-1.5.0/catalog.mk
-    /usr/local/share/licenses/libgcrypt-1.5.0/LICENSE
-    /usr/local/share/licenses/libgcrypt-1.5.0/GPLv2
-    /usr/local/share/licenses/libgcrypt-1.5.0/LGPL21
-    /usr/local/share/doc/libgcrypt
-    /usr/local/share/doc/libgcrypt/AUTHORS
-    /usr/local/share/doc/libgcrypt/COPYING
-    /usr/local/share/doc/libgcrypt/COPYING.LIB
-    /usr/local/share/doc/libgcrypt/ChangeLog
-    /usr/local/share/doc/libgcrypt/INSTALL
-    /usr/local/share/doc/libgcrypt/NEWS
-    /usr/local/share/doc/libgcrypt/README
-    /usr/local/share/doc/libgcrypt/README.SVN
-    /usr/local/share/doc/libgcrypt/THANKS
-    /usr/local/share/doc/libgcrypt/TODO
-    /usr/local/share/doc/libgcrypt/HACKING
-    /usr/local/share/doc/libgcrypt/README.apichanges
M    /usr/local/lib/ruby/site_ruby/1.9
-    /usr/local/sbin/pkg_fetch
-    /usr/local/sbin/pkg_glob
-    /usr/local/sbin/pkg_sort
-    /usr/local/sbin/pkgdb
-    /usr/local/sbin/pkgdu
-    /usr/local/sbin/portcvsweb
-    /usr/local/sbin/portsclean
-    /usr/local/sbin/portsdb
-    /usr/local/sbin/portupgrade
-    /usr/local/sbin/portversion
-    /usr/local/etc/pkgtools.status-pkg.sh
-    /usr/local/etc/pkgtools.conf.sample
-    /usr/local/lib/ruby/site_ruby/1.9/pkg.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgdb.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgdbtools.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkginfo.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgmisc.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgtools.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgtsort.rb
-    /usr/local/lib/ruby/site_ruby/1.9/pkgversion.rb
-    /usr/local/lib/ruby/site_ruby/1.9/portinfo.rb
-    /usr/local/lib/ruby/site_ruby/1.9/ports.rb
-    /usr/local/lib/ruby/site_ruby/1.9/portsdb.rb
-    /usr/local/man/man1/pkg_deinstall.1.gz
-    /usr/local/man/man1/pkg_fetch.1.gz
-    /usr/local/man/man1/pkg_glob.1.gz
-    /usr/local/man/man1/pkg_sort.1.gz
-    /usr/local/man/man1/pkgdb.1.gz
-    /usr/local/man/man1/pkgdu.1.gz
-    /usr/local/man/man1/portcvsweb.1.gz
-    /usr/local/man/man1/portsclean.1.gz
-    /usr/local/man/man1/portsdb.1.gz
-    /usr/local/man/man1/portupgrade.1.gz
-    /usr/local/man/man1/portversion.1.gz
-    /usr/local/man/man5/pkgtools.conf.5.gz
-    /usr/local/share/examples/pkgtools
-    /usr/local/share/examples/pkgtools/bash
-    /usr/local/share/examples/pkgtools/bash/complete.sample
-    /usr/local/share/examples/pkgtools/tcsh
-    /usr/local/share/examples/pkgtools/tcsh/complete.sample
-    /usr/local/share/zsh
-    /usr/local/share/zsh/site-functions
-    /usr/local/share/zsh/site-functions/_pkgtools
-    /usr/local/share/doc/pkgtools
-    /usr/local/share/doc/pkgtools/NEWS.md
-    /usr/local/share/doc/pkgtools/README.md
-    /usr/local/share/licenses/portupgrade-2.4.9.7,2
-    /usr/local/share/licenses/portupgrade-2.4.9.7,2/catalog.mk
-    /usr/local/share/licenses/portupgrade-2.4.9.7,2/LICENSE
-    /usr/local/share/licenses/portupgrade-2.4.9.7,2/BSD
-    /usr/local/etc/pkgtools.conf
-    /usr/local/man/man1/pkg_which.1.gz
-    /usr/local/man/man1/portinstall.1.gz
-    /usr/local/man/man1/ports_glob.1.gz
-    /usr/local/libdata/ldconfig/portupgrade
-    /usr/local/bin/pkgconf
+    /usr/local/bin/pkgconf
-    /usr/local/share/aclocal/pkg.m4
+    /usr/local/share/aclocal/pkg.m4
-    /usr/local/share/licenses/pkgconf-0.8.7_1
+    /usr/local/share/licenses/pkgconf-0.8.7_2
-    /usr/local/share/licenses/pkgconf-0.8.7_1/catalog.mk
+    /usr/local/share/licenses/pkgconf-0.8.7_2/catalog.mk
-    /usr/local/share/licenses/pkgconf-0.8.7_1/LICENSE
+    /usr/local/share/licenses/pkgconf-0.8.7_2/LICENSE
-    /usr/local/share/licenses/pkgconf-0.8.7_1/BSD
+    /usr/local/share/licenses/pkgconf-0.8.7_2/BSD
-    /usr/local/bin/pkg-config
+    /usr/local/bin/pkg-config
+    /usr/local/lib/libgcrypt.so.18
+    /usr/local/lib/libgcrypt.so
+    /usr/local/lib/libgcrypt.la
+    /usr/local/lib/libgcrypt.a
+    /usr/local/bin/dumpsexp
+    /usr/local/bin/hmac256
+    /usr/local/bin/libgcrypt-config
+    /usr/local/include/gcrypt.h
+    /usr/local/include/gcrypt-module.h
+    /usr/local/share/aclocal/libgcrypt.m4
+    /usr/local/info/gcrypt.info
+    /usr/local/share/licenses/libgcrypt-1.5.0_1
+    /usr/local/share/licenses/libgcrypt-1.5.0_1/catalog.mk
+    /usr/local/share/licenses/libgcrypt-1.5.0_1/LICENSE
+    /usr/local/share/licenses/libgcrypt-1.5.0_1/GPLv2
+    /usr/local/share/licenses/libgcrypt-1.5.0_1/LGPL21
+    /usr/local/share/doc/libgcrypt
+    /usr/local/share/doc/libgcrypt/AUTHORS
+    /usr/local/share/doc/libgcrypt/ChangeLog
+    /usr/local/share/doc/libgcrypt/INSTALL
+    /usr/local/share/doc/libgcrypt/NEWS
+    /usr/local/share/doc/libgcrypt/README
+    /usr/local/share/doc/libgcrypt/README.SVN
+    /usr/local/share/doc/libgcrypt/THANKS
+    /usr/local/share/doc/libgcrypt/TODO
+    /usr/local/share/doc/libgcrypt/HACKING
+    /usr/local/share/doc/libgcrypt/README.apichanges
+    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla
+    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA
+    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/mk-ca-bundle.pl
+    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA.pm
+    /usr/local/lib/perl5/site_perl/5.12.4/Mozilla/CA/cacert.pem
+    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla
+    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla/CA
+    /usr/local/lib/perl5/site_perl/5.12.4/mach/auto/Mozilla/CA/.packlist
+    /usr/local/lib/perl5/5.12.4/man/man3/Mozilla::CA.3.gz
+    /usr/local/sbin/pkg_fetch
+    /usr/local/sbin/pkg_glob
+    /usr/local/sbin/pkg_sort
+    /usr/local/sbin/pkgdb
+    /usr/local/sbin/pkgdu
+    /usr/local/sbin/portcvsweb
+    /usr/local/sbin/portsclean
+    /usr/local/sbin/portsdb
+    /usr/local/sbin/portupgrade
+    /usr/local/sbin/portversion
+    /usr/local/etc/pkgtools.status-pkg.sh
+    /usr/local/etc/pkgtools.conf.sample
+    /usr/local/lib/ruby/site_ruby/1.9/pkg.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgdb.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgdbtools.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkginfo.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgmisc.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgtools.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgtsort.rb
+    /usr/local/lib/ruby/site_ruby/1.9/pkgversion.rb
+    /usr/local/lib/ruby/site_ruby/1.9/portinfo.rb
+    /usr/local/lib/ruby/site_ruby/1.9/ports.rb
+    /usr/local/lib/ruby/site_ruby/1.9/portsdb.rb
+    /usr/local/man/man1/pkg_deinstall.1.gz
+    /usr/local/man/man1/pkg_fetch.1.gz
+    /usr/local/man/man1/pkg_glob.1.gz
+    /usr/local/man/man1/pkg_sort.1.gz
+    /usr/local/man/man1/pkgdb.1.gz
+    /usr/local/man/man1/pkgdu.1.gz
+    /usr/local/man/man1/portcvsweb.1.gz
+    /usr/local/man/man1/portsclean.1.gz
+    /usr/local/man/man1/portsdb.1.gz
+    /usr/local/man/man1/portupgrade.1.gz
+    /usr/local/man/man1/portversion.1.gz
+    /usr/local/man/man5/pkgtools.conf.5.gz
+    /usr/local/share/examples/pkgtools
+    /usr/local/share/examples/pkgtools/bash
+    /usr/local/share/examples/pkgtools/bash/complete.sample
+    /usr/local/share/examples/pkgtools/tcsh
+    /usr/local/share/examples/pkgtools/tcsh/complete.sample
+    /usr/local/share/zsh
+    /usr/local/share/zsh/site-functions
+    /usr/local/share/zsh/site-functions/_pkgtools
+    /usr/local/share/doc/pkgtools
+    /usr/local/share/doc/pkgtools/NEWS.md
+    /usr/local/share/doc/pkgtools/README.md
+    /usr/local/share/licenses/portupgrade-2.4.9.8,2
+    /usr/local/share/licenses/portupgrade-2.4.9.8,2/catalog.mk
+    /usr/local/share/licenses/portupgrade-2.4.9.8,2/LICENSE
+    /usr/local/share/licenses/portupgrade-2.4.9.8,2/BSD
+    /usr/local/etc/pkgtools.conf
+    /usr/local/man/man1/pkg_which.1.gz
+    /usr/local/man/man1/portinstall.1.gz
+    /usr/local/man/man1/ports_glob.1.gz
+    /usr/local/libdata/ldconfig/portupgrade

Также?