Shown in the header and used in export filenames. It is stored only on this device — never sent anywhere. Initials are fine.

With a passphrase, the backup file is AES-encrypted, so it stays private even if it lands in email or shared cloud storage. Without one, the file is readable by anyone who has it. Remember the passphrase — an encrypted backup cannot be opened without it.

Merge adds only days that are missing on this device (safe). Replace erases everything on this device and loads the backup instead.