Is it necessary to include the /run directory in backups?

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http://serverfault.com – I use a variant of the simple script below from the Community Ubuntu Documentation described tar -cvpzf backup.tar.gz --exclude=/backup.tar.gz --exclude=/proc --exclude=/lost+found --exclude=/sys --exclude=/mnt --exclude=/media --exclude=/dev / I used it again on Ubuntu 12.04 and I saw some files from the /run being skipped by the script. Should the /run directory be added to the excluded directories? (HowTos)