How to Transfer Contacts From One Gmail to Another?

I had to transfer contacts from one Gmail to another when my company merged two departments and asked us to consolidate communication records into one Gmail ID. Initially, I tried the standard CSV export process, but I noticed that repeated imports can create duplicate entries, and cleaning them later is frustrating. Since our contact database contained hundreds of entries with addresses, alternate emails, and notes, I needed a smarter method that could safely back up everything first and then help with migration. During this search, I came across the SysInfo Gmail Backup Tool, and it turned out to be extremely practical for business users. It can securely download Gmail contacts to a local drive, supports bulk processing, and provides several output formats such as MBOX, EML, CSV, and PDF, depending on future needs. The tool also migrates calendars, photos, and emails together, which is useful for a full account backup. I also appreciated the preview feature because it lets you verify items before saving. For professionals dealing with organizational Gmail restructuring, this solution reduces manual workload significantly and keeps data protected.