I'm helping a family member switch email providers, and before making the move I wanted For Backup IMAP Emails locally so we had a complete copy of everything. I also needed a tool that could transfer emails directly between IMAP accounts without making the process overly complicated.

During my search, I came across the MacSonik IMAP Backup Tool. Besides creating local backups, it can migrate emails from one IMAP account to another, which was exactly what I needed. It also supports direct migration to Gmail, Office 365, and Google Workspace, so it isn't limited to simple exports.

A feature I found particularly useful was the option to keep or exclude attachments depending on the situation. If storage space is limited, you can transfer only the email messages. Alternatively, attachments can be saved separately as PDF files, making them easier to organize without losing access to important documents.

Another thing worth mentioning is that the software maintains the original folder hierarchy, so after migration all folders appear in the same structure as before. I also didn't notice duplicate emails being created because it includes duplicate detection based on fields like Subject, From, To, and Body.