once you have imported the attachments to files you can simply drop the filedata column and this will reduce your attachments table to kb instead of mb. Though you will have to remember to backup the attachments folder on your server every once and a while. I simply gzip it then download it to another server, cause then i get about 2mbps.
With database backups you still need to include the attachments table as this holds the file hashes and other stuff, just it won't be so large.
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