# Backup ```sh imap-backup backup ``` This command runs the backup operation using information provided by a configuration file created using `imap-backup setup`. By default, emails for all *configured* accounts are copied to disk. The backup is incremental and interruptible, so backups won't get messed up if your connection goes down during an operation. # Single Account Backups As an alternative, if you only want to backup a single account, you can pass all the necessary parameters directly to the `single backup` command (see the [`single backup`](./single-backup.md) docs). # Serialized Format Emails are stored on disk in [Mbox files](../files/mboxrd.md), one for each folder, with metadata stored in [Imap files](../files/imap.md). The Imap file contains information about the email messages stored in the Mbox file. For each, it has the offset to the start of the message and its length. # Output Verbose output can be configured by adding the `--verbose` (or `-v`) parameter. Add that parameter twice will also show all network traffic between imap-backup and the IMAP server.