うーん、定時バックアップのコマンドを手で打ってみたけど、問題なくとれた、、、。

DUMP: Date of this level 1 dump: Mon Jun 21 13:23:12 2004
DUMP: Date of last level 0 dump: Sun Jun 13 13:00:14 2004
DUMP: Dumping snapshot of /dev/da1s1d (/home) to /var/backup/L1/dumper-home.dump
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 576998 tape blocks.
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: DUMP: 585437 tape blocks on 1 volume
DUMP: finished in 224 seconds, throughput 2613 KBytes/sec
DUMP: level 1 dump on Mon Jun 21 13:23:12 2004
DUMP: Closing /var/backup/L1/dumper-home.dump
DUMP: DUMP IS DONE