A snapshot is a backup of the entire internal memory of the MD.
When you loaded in the Elektron packs, then you probably overwrote your personalized patterns and kits. If you didn’t backup your kits and patterns from the internal memory to a snapshot before you overwrote them, then you have lost them.
It’s very worthwhile reading about the +Drive (page 3 of the MD manual) and the FILE menu (page 63 of the manual).
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