Backups
We take LDAP and Kerberos backups twice daily. Backups on auth1 occur at 4am and on auth2 they occur at 4pm. On each machine, backups are stored in /backup/{ldap,krb5} (in the case of auth1, this is /backup exported from the NetApp).
Miscellaneous backups (including backups of home directories for expired accounts) are stored in /users/backup (accessible on any system that NFS-mounts /users).
MySQL
We don't currently backup MySQL. See the historical version of this page for previous backup strategy.