How to fix, BoldGrid Backup, Functionality test has failed?

BoldGrid Backup

Functionality test has failed.

Functionality Test Report

Home directory
/home/********

Home directory writable?
Yes

WordPress directory writable?
Yes

Backup directory exists?
Yes

PHP ZipArchive available?
Yes

PHP Bzip2 available?
Yes

PHP Zlib available?
Yes

PHP LZF available?
No

System TAR available?
Yes

System ZIP available?
Yes

PHP in safe mode?
No

System mysqldump available?
Yes

System crontab available?
No

WordPress version:
4.9.1

Is WP-CRON enabled?
Yes

Functionality test status:
FAIL