I'm currently working with ArcMap 10.7. Therein, I regularly do File > Save a Copy of an existing ArcMap-project to create a copy for another ArcMap version. However, the file size of the original ArcMap-project (e.g. 3692 KB) is roughly double of the size of its copy (i.e. 1842 KB). The inconsistency of file size occurs in any direction, no matter if I copy ArcMap 10.3 > ArcMap 10.7, ArcMap 10.5 > ArcMap 10.3 etc. What's the reason that the original file is of double size of its copies?

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    It could be that the original has saved geoprocessing history in it which is not passed on when saving as a copy. Try clearing geoprocessing history in the original and save, is the size reduced?
    – BERA
    Mar 31, 2020 at 10:04


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