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<title>Munipack ‒ Backup strategy</title>
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<section>
<h1 id="backup">Backup Strategy</h1>
<p>Munipack modifies the backup strategy of FITS files.
Both the Unix philosophy, as well as common FITS conventions,
are modified.
</p>
<h2>The declaration</h2>
<ul>
<li>All observed data are highly valuable original.
They are untouchable.</li>
<!--
<li>All operations on newly created HDU, like their adding or removing,
are considered as a reversible action. </li>
-->
<li>Any file, created by a processing, can be overwritten without caution.</li>
</ul>
<h2>Practical implications:</h2>
<ul>
<li>All actions which can potentially modify original image data
(currently only <samp>phcorr</samp>) refuses actions on its by default.
The rule can be supressed by <samp>--enable-overwrite</samp> switch
for <samp>phcorr</samp>, yet strongly discouraged!
</li>
<li>
All processing should be done under a dedicated working directory.
The file handling is proposed by the way
(see <samp>-t destination_dir</samp> on the current <samp>"-t ."</samp>
directory):
<pre>
$ ls /obs/archive/*.fits
$ mkdir work/
$ cd work/
work$ munipack phcorr [...] -t . /obs/archive/*.fits
</pre>
</li>
<li>
By default, the label <samp>_proc</samp> is included in filenames
when the output directory, by <samp>-t</samp> switch, is not specified.
This is common for <samp>phcorr, astrometry, find, aphot, gphot</samp>.
</li>
<li>
The outputs of <samp>phcal</samp> are expected to be included
in the working directory so the label <samp>_cal</samp> is added
to original filenames by default.
</li>
<li>
All newly created files by <samp>bias, dark, flat, cone, kombine,
colouring, votable, cross, artifical </samp> are silently overwritten
for convenience. Perhaps, some processing time can only be lost.
</li>
</ul>
<p>The backup strategy has been changed between versions 0.5.10 and
0.5.11 (January 2018), revised in 0.5.13 (November 2020)
and 0.6.2 (January 2025).
</p>
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