Most veteran note takers will advise against importing old notes into a new digital space for the extra amount of administrative overhead and refactoring it can create.

Often old notes may be: - well assimilated into your memory already - poorly sourced or require lots of work and refactoring to use or reuse them - become a time suck trying to make them "perfect"

Better advice is potentially pull them into your system in a different spot so they're searchable and potentially linkable/usable as you need them. If this seems like excessive work, and it very well may be, then just pull in individual notes as you need or remember them.

With any luck the old notes are easily searchable/findable in whichever old system they happen to be in, so they're still accessible.

I'll note here the conflicting definitions of multiple storage in my tags to mean: - storing a single note under multiple subject headings or index terms - storing notes in various different (uncentralized locations), so having multiple different zettelkasten at home/office, storing some notes in social media locations, in various notebooks, etc. This means you have to search across multiple different interfaces to find the thing you're looking at.

I should create a new term to distinguish these two, but for now they're reasonably different within their own contexts that it's not a big problem unless one or the other scales.