What is the IPF file?
That is the backup file created by IPFire when you do a backup. They are stored in the directory
/var/ipfire/backup/
The addon .ipf files are stored in
/var/ipfire/backup/addons/backup/
When you choose to download one of your backup files using the WUI backup menu page then the .ipf files are downloaded to the directory location you specify.
But what is it for?
The backup file stores the configuration data for IPFire so if you have a problem or you change things in a way you didn’t intend to and want to go back to an earlier status you can restore the backup to your system.
In terms of IPFire the wiki describes the backup process in the following page
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