xfs_quota -x -c 'quota -v -N -p 4000187' /var/backup
/dev/vdb1 vdb 0 0 1048576 00 [--------] /var/backup
If you copied data into the project, the output will look something like:
/dev/vdb1 vdb 512000 0 1048576 00 [--------] /var/backup
To give you an overall view of the whole system: