7 Components: the Function Pages - Developers

process was “quiet,” that a requested page does not exist or that a
page has been revised, as well as the IP address. This information
can give you an idea of what sensitivities and errors may exist during
processing.
15.8
Backing Up Data
Any computer system is susceptible to technological failure. When
this happens, total data loss is possible. That is why it is advisable to
back up data in your TWiki at regular intervals and save the copies
in a separate location.
Page data is stored in the directory data. To back it up, simply
copy the entire directory or archive it. When this is done, the current
versions as well as the history of the files are saved. Uploaded files
are saved in the pub directory, which you should also back up. Under
Unix, the command to back up data is as follows:
tar czvf backup_data.tar.gz */*
You must be in the respective directory. Form data does not need to
be backed up separately, since it is saved as metadata in the respective
topics and thus included in your backup.
To reload the data, unpack both archives to the directories data
and pub. If you want to be extra careful, you should first empty
those directories. This is especially true if you want to restore an
older state of the wiki because, for instance, in the meanwhile, vandals
have left their marks. This is the only way to make sure that no
unwelcome remnants are still lurking in the webs.
15.9
Upgrading and Uninstalling
Since a new version of TWiki is released from time to time, it may
happen that you may want to update your installation. Starting with
the version accompanying this book, there is an installation script
called UpgradeTwiki, which automates the updating process. To use
it, generate a new directory and unpack the TWiki archive into it.
Now you just have to decide in which directory the new TWiki is to
be installed. Then enter the following command in the command
line level:
Save all pages
Restoring data
15.8 Backing Up Data �
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