Now normally you can keep mincemeat in sterilized jars for ages (literally years!) without it spoiling.  However, this version contains less sugar and doesn’t have any alcohol to preserve it so I wouldn’t risk keeping it in a jar out of the fridge.  It should keep happily in the fridge for a few weeks (much like low sugar jam).  You can of course keep it in the freezer too.  In fact, the first batches of mince pies that I made this year were with last year’s mincemeat from the freezer!