backup [options] <operation>
Display help.
The required operation to perform.
Request that all backup aware modules release their file handles and prepare for a backup.
Request that all backup aware modules reclaim their file handles.
Put the handset into backup mode.
A means of requesting backup aware modules to close their file handles. Note, this command does not actually perform a backup, it merely prepares the system for one. It can be useful if you want to copy a file that is normally held open by a running process. Another strategy if this doesn't work (note, not everything is backup aware) is to do something like:
kill -m some-process && cp some-file .
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