"per_volume_ gigabytes" , "backup_gigabytes" and "backups" items can be shown in "openstack quota show" command, but can't be updated by "openstack quota set".

(openstack) quota set -h
usage: quota set [-h] [--class] [--properties <properties>]
                   [--server- groups <server-groups>] [--ram <ram>]
                   [--key- pairs <key-pairs>] [--instances <instances>]
                   [--fixed- ips <fixed-ips>]
                   [--injected- file-size <injected- file-size> ]
                   [--server- group-members <server- group-members> ]
                   [--injected- files <injected-files>] [--cores <cores>]
                   [--injected- path-size <injected- path-size> ]
                   [--gigabytes <gigabytes>] [--volumes <volumes>]
                   [--snapshots <snapshots>] [--subnetpools <subnetpools>]
                   [--vips <vips>] [--members <members>] [--ports <ports>]
                   [--subnets <subnets>] [--networks <networks>]
                   [--floating- ips <floating-ips>]
                   [--health- monitors <health-monitors>]
                   [--secgroup- rules <secgroup-rules>] [--secgroups <secgroups>]
                   [--routers <routers>] [--rbac-policies <rbac-policies>]
                   [--volume- type <volume-type>]
                   <project/ class>

Set quotas for project or class

positional arguments:
  <project/class> Set quotas for this project or class (name/ID)

optional arguments:
  -h, --help show this help message and exit
  --class Set quotas for <class>
  --properties <properties>
                           New value for the properties quota
  --server-groups <server-groups>
                           New value for the server-groups quota
  --ram <ram> New value for the ram quota
  --key-pairs <key-pairs>
                           New value for the key-pairs quota
  --instances <instances>
                           New value for the instances quota
  --fixed-ips <fixed-ips>
                           New value for the fixed-ips quota
  --injected- file-size <injected- file-size>
                           New value for the injected-file-size quota
  --server- group-members <server- group-members>
                           New value for the server- group-members quota
  --injected-files <injected-files>
                           New value for the injected-files quota
  --cores <cores> New value for the cores quota
  --injected- path-size <injected- path-size>
                           New value for the injected-path-size quota
  --gigabytes <gigabytes>
                           New value for the gigabytes quota
  --volumes <volumes> New value for the volumes quota
  --snapshots <snapshots>
                           New value for the snapshots quota
  --subnetpools <subnetpools>
                           New value for the subnetpools quota
  --vips <vips> New value for the vips quota
  --members <members> New value for the members quota
  --ports <ports> New value for the ports quota
  --subnets <subnets> New value for the subnets quota
  --networks <networks>
                           New value for the networks quota
  --floating-ips <floating-ips>
                           New value for the floating-ips quota
  --health-monitors <health-monitors>
                           New value for the health-monitors quota
  --secgroup-rules <secgroup-rules>
                           New value for the secgroup-rules quota
  --secgroups <secgroups>
                           New value for the secgroups quota
  --routers <routers> New value for the routers quota
  --rbac-policies <rbac-policies>
                           New value for the rbac-policies quota
  --volume-type <volume-type>
                           Set quotas for a specific <volume-type>