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FWIW, this is my opinion only. Take it for what it's worth.
When making backups or moving directory trees around, unless you are willing
to live with potential file syncronization errors, the sysadm should take the
system into single user mode before starting the copy, and revert to multiuser
mode once the copy (and validation) is complete.
S/he might risk remaining in multiuser mode /if/ the directory tree is stable
(no changes to it will be made during the time the backup or move process is
executing), but for active directory trees (/var or /home, for instance) the
only /safe/ way to move them is to restrict access to read only or no access
Having said all that, it depends on the environment and the use of the
machine. Some systems can be permitted to be volatile or unstable, while
others are required to be available 7/24. In either case, it may be unsuitable
to restrict write access to directories and files while backing them up or
moving them. That's a risk that site management must evaluate and deal with.
Master Codewright & JOAT-in-training | GPG public key available on request
Registered Linux User #112576 (http://counter.li.org/)
Slackware - Because I know what I'm doing.
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