Managing multiple IMAP email accounts can become challenging when each mailbox contains years of business communication, attachments, and important records. I’m looking for a reliable way to archive several IMAP accounts in one backup process instead of downloading emails manually from individual folders.

My main requirement is to keep a local copy of each mailbox while maintaining an organized structure. I also want to ensure that important email details, including sender information, timestamps, message content, and attachments, remain accessible after the backup. Since these accounts belong to different projects, keeping their archived data properly separated would make future searches and recovery much easier.

What is the best approach for bulk IMAP email backup? Is it better to create a separate backup file for each account or save everything in a centralized archive? I’m also interested in whether a backup process can support folder selection, multiple output formats, and large mailboxes without requiring constant manual intervention.

The output format is another consideration. MBOX can be useful for mailbox archiving, EML stores individual messages, and PST is convenient for many Outlook-based workflows. PDF may be suitable for retaining selected emails as readable records, but it is not a substitute for a complete mailbox backup when future email access or migration is required.

I found the SysInfoIMAP Backup Tool, which supports exporting IMAP mailbox data into formats such as PST, MBOX, EML, MSG, PDF, and CSV. It may be worth evaluating for this type of task, depending on the provider’s authentication requirements and the number of accounts involved.

Before running a full backup, I would test one mailbox, verify the exported message count, inspect attachments, and confirm that the folder structure is preserved. It is also important to check server connection limits and available storage when processing several accounts.