Does anyone have any experience in importing decks? I have a new deck I wish to import, however I also want to keep my old ones. Will I solve this problem simply be creating another user, or will my old deck be deleted if I import the new one to a different user?
Importing a single deck (.apkg file) will add that deck to your collection, but if you import a collection file (.colpkg) your entire collection will be replaced.
So if I import a collection file, will it replace my collection on all users?
Your collection will replace users’ collections if they import it and click Yes to the message shown.
To add to what abdo said, if you have a .colpkg file and would like to import it into your existing collection, It’s recommended to create a new (blank) profile, import the .colpkg there, export the decks you want to .apkg files, swicht profile again, and import those files into your main profile.