For now it is not possible to change temp folder of engine backup - /tmp to something else.
2017-01-18 03:05:02 27138: Start of engine-backup mode backup scope all file /var/ovirt/backup.tar
2017-01-18 03:05:02 27138: Backing up:
2017-01-18 03:05:02 27138: Generating pgpass
2017-01-18 03:05:02 27138: Creating temp folder /tmp/engine-backup.oLpdkwhWhp/tar
2017-01-18 03:05:02 27138: - Files
2017-01-18 03:05:03 27138: Backing up files to /tmp/engine-backup.oLpdkwhWhp/tar/files
2017-01-18 03:05:07 27138: - Engine database 'engine'
2017-01-18 03:05:07 27138: Backing up database to /tmp/engine-backup.oLpdkwhWhp/tar/db/engine_backup.db
2017-01-18 03:05:21 27138: - DWH database 'ovirt_engine_history'
2017-01-18 03:05:21 27138: Backing up dwh database to /tmp/engine-backup.oLpdkwhWhp/tar/db/dwh_backup.db
Actually engine-backup use mktemp to create tmp folder.
Workaround is to change /usr/share/ovirt-engine/bin/engine-backup.sh and set/change TEMP_FOLDER line.
Could be possible to define different temp directory in engine-backup option.
Changing temp dir is already possible. engine-backup honor system temporary folder defined in $TMPDIR.
If a different tmpdir is needed, a TMPDIR=/path/to/tmpdir engine-backup <args> should be enough.
Is something different desired / expected here?
*** This bug has been marked as a duplicate of bug 1439332 ***