The missing emails after completing a backup using a Gmail Backup Tool are mainly due to interrupted IMAP synchronization, faulty mailbox filter settings, network instability, or incomplete folder mapping. Users tend to forget to include crucial Gmail labels like All Mail, Sent, or archived folders in the backup setup.

To avoid such mailbox inconsistencies, you can use the TrustVare IMAP Backup Tool. The software performs advanced Gmail mailbox synchronization and ensures complete email backup without data loss. You can use the free trial and see their back process before buying this tool. During export, the software additionally verifies the mailbox and eliminates the possibility of missing and skipped emails during the backup.

Key Features:

• Secure Gmail backup with IMAP and enhanced authentication
• Backup Gmail Emails to PST, MBOX, EML, MSG and PDF Formats
• Keeps folder structure, metadata, and attachment intact 
• Supports selective backup of emails with date filter options
• Handles large Gmail mailboxes without sync error

Read for more information: https://www.verdoos.com/read-blog/46668_how-to-export-imap-emails-to-pst-format-without-outlook.html