I suggest you forget about backing up anything Qmail is doing. When you take your backup, there may be something in a queue somewhere, but it will certainly be gone shortly after. Not only that, qmail's files are named based on their inode number (as I recall), so restoring them from backup is straight backward.

Backup your Squirrel mailboxes as you'd backup any other files.

I'm not sure why you're interested in "continuously" backing up. You may want hardware that replicates at the block level. It's important to figure out what scenario you're trying to protect against. A constantly updated backup protects against hardware failure, but it's not good for the case where someone deletes something and later regrets it. For that you want snapshots going back in time.

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