There is some recent discussion of this in How to limit backups to a certain total size? (Uncategorized category) and some older discussion (plus coming partial step to this) under What does –quote-size? (Support category).
There is some recent discussion of this in How to limit backups to a certain total size? (Uncategorized category) and some older discussion (plus coming partial step to this) under What does –quote-size? (Support category).