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To back up a VxFS file system, you first create a read-only snapshot file system, then back up the snapshot. This procedure lets you keep the main file system on line. The snapshot is a copy of the snapped file system that is frozen at the moment the snapshot is created.
See Online backup using file system snapshots.
See the mount(1M), mount_vxfs(1M), vxdump(1M), and vxrestore(1M) manual pages.