утилита инкрементного дампа файловой системы XFS (XFS filesystem incremental dump utility)
Ошибки (баги) (Bugs)
xfsdump does not dump unmounted filesystems.
The dump frequency field of /etc/fstab is not supported.
xfsdump uses the alert program only when a media change is
required.
xfsdump requires root privilege (except for inventory display).
xfsdump can only dump XFS filesystems.
The media format used by xfsdump can only be understood by
xfsrestore.
xfsdump does not know how to manage CD-ROM or other removable
disk drives.
xfsdump can become confused when doing incremental or resumed
dumps if on the same machine you dump two XFS filesystems and
both filesystems have the same filesystem identifier (UUID).
Since xfsdump uses the filesystem identifier to identify
filesystems, xfsdump maintains one combined set of dump
inventories for both filesystems instead of two sets of dump
inventories. This scenario can happen only if dd or some other
block-by-block copy program was used to make a copy of an XFS
filesystem. See xfs_copy(8) and xfs(5) for more details.