Backup strategy for Munipack modifies both traditional Unix system as well as FITS conventions. There are general rules:
$ mkdir work/ $ munipack phcorr ... -t work/ data/*.fitsBy default, the label _proc is included in filenames when the output directory by -t switch is not specified. This is common for phcorr, astrometry, find, aphot, gphot.
The backup strategy has been changed between versions 0.5.10 and 0.5.11 (January 2018).