Other disk space errors are:

ARTIFACTORY: Why is my backup failing?

AuthorFullName__c
Aviv Blonder
articleNumber
000004255
ft:sourceType
Salesforce
FirstPublishedDate
2018-09-06T15:38:05Z
lastModifiedDate
2018-09-06
VersionNumber
7
2022-05-03T17:40:11.325Z [jfrt ] [ERROR] [917rg63xp7ra109y] [o.a.b.BackupJob:93 ] [art-exec-5 ] - Not enough free space to perform backup. A threshold for max used space is exceeded before the backupbackup-daily

Or,
2022-05-06T09:11:25.509Z [jfrt ] [ERROR] [3p0kd03xp9mm1za6] [o.a.b.BackupJob:93 ] [art-exec-4 ] - Not enough free space to perform backup. A threshold for max used space is going to be exceeded after the backupbackup-daily

This occurs when at least 90% of the storage space is being used, or if this percent will be used after the backup process is done. You may change this percent with this system property:
artifactory.backup.maxUsedSpacePercent=90

2. Permissions on the backup folder. If the target backup folder has wrong permissions, the log should look like this:
2022-05-13T00:14:58.686Z [jfrt ] [ERROR] [472240fd3fa241ad] [o.a.b.BackupSizeCalculator:98 ] [art-exec-24 ] - Can't estimate free space in backup target location path. Skipping a check for 'max used space before backup' threshold.
java.nio.file.AccessDeniedException: /root/bkp

2022-05-13T00:14:58.690Z [jfrt ] [ERROR] [472240fd3fa241ad] [o.a.b.BackupJob:136 ] [art-exec-24 ] - An error occurred while performing a backup: Backup directory provided in configuration: '/root/bkp' cannot be created or is not a directory.

Or:
2022-05-13T00:18:45.625Z [jfrt ] [ERROR] [a732bc8d69a31063] [ifactoryApplicationContext:768] [art-exec-6 ] - Failed to create backup dir: /opt/jfrog/artifactory/var/backup/artifactory/backup-daily/current: Unable to create directory /opt/jfrog/artifactory/var/backup/artifactory/backup-daily/current

In order to overcome this, make sure that the user who starts Artifactory has sufficient permissions to create the desired backup directory.

3. NFS unavailable. In some cases, you will want to save the backup content in an NFS share volume. Therefore, this NFS mount should be available throughout the backup process.

*Note: log messages may vary between Artifactory versions.

If your backup is failing and you still can't find the reason, please contact JFrog Support via the Support Portal.