It was noted in CentOS Bug 7795 that the amanda package in CentOS does not have dump or xfsdump support:
http://bugs.centos.org/view.php?id=7795
I found that it is also like this upstream and they plan to fix it at some point: https://bugzilla.redhat.com/show_bug.cgi?id=1140321
In the mean time, I have created 2 sets of RPMs .. one with dump support and one with dump and xfsdump support:
Dump Only: http://people.centos.org/hughesjr/c7-amanda/dump-only/
Dump and XFSDump: http://people.centos.org/hughesjr/c7-amanda/xfs-support/
If we can get some people who actually use amanda to check these files and feedback into the CentOS Bug (7795 link above), we might help the RHEL team with deciding how to compile the fix (with dump only or dump and xfsdump support). Please feedback to the CentOS-Devel mailing list or bug 7795.
NOTE: These RPMs should work, but they are not signed and should be considered testing quality at present .. so not production ready without user testing at this point.
Thanks, Johnny Hughes