dumpBackup is one of them.
|Open||None||T27782 Migrate the rest of the maintenance scripts to subclass maintenance|
|Open||Parent5446||T36117 Make maintenance/userOptions.php subclass Maintenance|
|Resolved||• hashar||T36436 mwdocgen.php: rewrite to extends Maintenance class|
|Invalid||None||T47254 Make eval.php subclass Maintenance|
|Resolved||Unicornisaurous||T122587 Make dumpBackup.php subclass Maintenance|
|Resolved||Unicornisaurous||T122588 Support multiple occurrences of options in Maintenance class|
So it appears all of the maintenance/ directory scripts listed here have yet to be done with the exception of importDump.php. I didn't check the subdirectories but I imagine there has been less attention given to those. Would it be worth creating subtasks for all of these?