How to make backup files that never exceed a predefined size

Imposing certain limits can be quite handy even nowadays of cloud computing. It will, for instance, help you to automatically distribute your backups over several free online storage services with limited space. I've heard of people who get a Gmail address just to have online backups that are surely available even when Dropbox and friends are blocked or monitored: in those cases, making sure that attachments never exceed some predefined size helps to send email to those accounts, even through servers that refuse to handle very large messages.

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