The first launch of 2.0 migrates your old notes database automatically, verifies the result, and keeps a pre-migration backup of the old file.
If Antinote detects an old database that hasn't been imported, an "Antinote 1.1.7 or earlier" section appears in Settings > Notes with an Import button — and a Use Backup File button in case you need to migrate from one of your 1.x backups instead.
Before you commit, the confirmation tells you how many notes the old database holds, when it was last changed, and how many of them would be imported or restored.
Import also brings back notes you deleted in 2.0, as long as they still exist in your old database — including ones The Void has already cleared out. A note still sitting in The Void returns to the position you deleted it from, with its checklist items and links intact.
Importing twice is safe. Notes already in Antinote are matched by identity and left untouched, so nothing is duplicated and edits you made in 2.0 are never overwritten.
Import reads your live 1.x database and takes a fresh backup of it first. Use Backup File reads whichever 1.x backup you pick instead, and leaves that file untouched.

Upgrading from Antinote 1.x