Keep your collection of custom filters through a minor updates to patch Gramps (e.g., from version 5.1.0 to 5.1.2) by manually copying your custom_filter.xml from Gramps User Directory to the corresponding directory in new gramps_version_number. Even minor upgrades with feature changes (e.g., from a 5.0.x to a 5.1.x version) may include XML format changes since the recent innovation of addon rules are causing rapid evolution in Filters. So porting filters in this manner requires verification that the XML definitions haven't changed. Also, Addon rules may have to be installed in the new upgrade before copied custom filters will work safely.
Most programs storing family history data can export and import GEDCOM (.ged) files. But, because the 1996 vintage GEDCOM data file specification remained in "Draft" status from Oct.1999 to Nov.2019, every genealogy tool has had to take liberties to shoehorn their data into something that has been long outgrown. (See the sections below to see a list of idiosyncrasies reported in different Genealogy software tools.) You would be unlikely to find any tool generating a 100% compliant and standard GEDCOM format. (A new 7.0.2 revision was finally published in June of 2021. See GEDCOM 7 support for the current state of development.)
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