Backups and Google Drive
The backup chip, the freshness dot, and a backup file in your own Drive.
The backup chip
The chip in the panel footer is the backup center. Its dot tells you where you stand at a glance: green means your latest edits are covered by a backup or sync, orange means there are edits newer than your last one.
Local file
The Export in Settings writes a single JSON file with everything (see Import and export for choosing less). The file is plain, portable data you can keep anywhere; it is also the escape hatch if you ever leave.
Google Drive backup
Connect your own Google Drive and FillKit keeps one backup file there, updated whenever you press Back up now. It is deliberately manual and it is your Drive, your file: FillKit has no server in the middle.