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One of the emacs's nice features is Backup.
But is there any way to prevent backup for files larger than 3MB? Thanks!

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I haven't tested this, but here's an example of how you could advise backup-enable-predicate so that your size check happens only after the default backup-enable-predicate has determined that your file should be backed up:

(add-function :after-while backup-enable-predicate
              (lambda (file)
                ;; Back up FILE only if it is smaller than 3 MiB.
                (< (file-attribute-size (file-attributes file)) 3145728)))

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