Possibly yet another alternative backup scheme that doesn't require a change of run level (which I use on our one ubuntu server) is to use LVM partitions, but keep lvm space free to snapshot backups. Then use lvcreate to create a snapshot backup, mount it and run your backup software against the snapshot. Remove snapshot when done. For databases just make sure they are quiesced/blocked and buffers flushed before snapshot, after snapshot just release the blocking. Snapshot only takes a second or two to complete. I'm pretty sure it gets in use binaries, system seems to restore fine... Back in 21/12/2009 I asked about this in thread "Point-in-Time Backup and Restore - any gotchas?" where I had the start of a script to do it.
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