The difference between merging and appending is this:
Suppose your ordinary file has 500 records and you receive another file which has another 500 records. If you simply append the second file into the first, the records from the second file will be added to the first file, and you will end up with a file that contains 1,000 records. You append one file into another when the 2 files have no 'overlap' - that is, none of the records are about the same people.
If however you merge the second file into the first file, you don't just add records from one file to the other. Instead, records that are about the same people are matched. Then when you merge the 2 files, the matching records are merged. This means that although you might end up with a file that had 1,000 records, this would only happen if no matching records were found. If all 500 records in each file matched, you would end up with a file that still contained only 500 records. Or, depending on which records matched, you could end up with anything in between.
Although Family Historian will automatically check for matches for you (but you can always check and override its 'recommendations'), this can be a slow process if you have very large files; so you may prefer to tell it not to do so, if you know that there are no matches, and you want to append one file into another. In this case, follow the instructions in How to Merge in Data From Another File except that when you are given the choice (when the Record Matching Options Dialog appears), choose the option . Then when the Merge/Compare Dialog appears, all records will be shown unmatched and you can click to append the one file into the other.
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