Functionality test has failed Boldgrid Backup on GCP help!

Hi thanks. Have SSH’d onto the google compute VM. added the 755 permission to the folder and also created the directory blodgrid_backup but am still getting this error message. Any advice? Thanks

Home directory
/var/www ()

Home directory writable?
Yes

WordPress directory writable?
Yes

Backup directory exists?
No

PHP ZipArchive available?
Yes

PHP Bzip2 available?
Yes

PHP Zlib available?
Yes

PHP LZF available?
No

System TAR available?
Yes

System ZIP available?
No

PHP in safe mode?
No

System mysqldump available?
Yes

System crontab available?
Yes

WordPress version:
4.8.2

Is WP-CRON enabled?
Yes

Functionality test status:
FAIL

Hi thanks!,

Done that and now still getting this error. Has anyone else used boldgrid backup on Google Compute VM? the backup compatability page goes to a 404 so cannot ascertain if GPE is even supported! Thanks for any advice anyone can provide!
BoldGrid Backup

Could not create directory “/var/www/boldgrid_backup”.

Functionality test has failed.

Could not create directory “/var/www/boldgrid_backup”.

Functionality Test Report

Home directory
/var/www ()

Home directory writable?
Yes

WordPress directory writable?
Yes

Backup directory exists?
No

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?
Yes

WordPress version:
4.8.2

Is WP-CRON enabled?
Yes

Functionality test status:
FAIL