They've made fairly boring choices to store data which makes it fairly easy to rewrite perkeep in the future if that were to happen. However, it's likely that G

They've made fairly boring choices to store data which makes it fairly easy to rewrite perkeep in the future if that were to happen. However, it's likely that Go will be maintained in to the future. Perkeep's format is basically chunks of files ("blobs") named after their sha256 hash which can be reindexed as needed. So while the files stored may require software which could be gone the files and etc. will be there in the worst case that the project disappears.