Symptoms
Tasks to create backup of a webspace fail with the error:
Task name Backup 'Webspace "s123456.instanturl.tld"' into group 'backupgroup123456'
.....
Method name taskCreateBackupData on SCREF:BackupManager:0
Last execution output Destination host 'HOSTNAME' (#XXX), IP '192.168.10.100' : write /custbackups//backup_data-123.tar: No space left on device (errno 28).
Cause
As explained in the error, there is no free space on the backup server:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 20G 2.2G 17G 12% /
/dev/sda3 365G 365G 0 100% /custbackups
/dev/sda1 99M 39M 56M 42% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
Resolution
In order to fix this issue, please increase disk space of /custbackups partition and re-run the failed task(s) after that.