hello

i wanted to ask you for precise information:

what is BEST and SURE for SAVE long time and future from GRAMPS?
for now gramps have many file export:

-gramps grdb
-GEDCOM
-Gramps XML
-Gramps Package
-GW
-WFT
-vCard
-vCalendar
-CSV


i wanted not lost data or information for my genealogical tree...