Sql Maintainance plan which takes Full backups of 6 databases is failing with the following error:

Error Number: -1073548784

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Executing the query "BACKUP DATABASE [DatabaseName] TO DISK = N'\\\\BackupLocation" failed with the following error: "Write on "\\\\backuplocation\DatabaseName.bak" failed: 112(There is not enough space on the disk.)

BACKUP DATABASE is terminating abnormally.

10 percent processed.

20 percent processed.

30 percent processed.

40 percent processed.

50 percent processed.

60 percent processed.

70 percent processed.

80 percent processed.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.-

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The backup job runs every day and it failed yesterday. All the othere databases in the package ran successfully taking the backup.(Backups files are valid.) The backup file of this database is usually comes around 55gb and when this job ran there was enough space of >150gb. Backups are saved on Local server connection.Today the backup file came to 56 gb and the job was successful today.

Any reasons why did the job failed?