Backup Fails – No Errors Showing

screencast of the issue: https://share.getcloudapp.com/rRu65AD8
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system info: https://share.getcloudapp.com/Qwu7jJzb

WP Memory Limit 96 MB
PHP Max Input Vars 3000
PHP Max Input Vars (allowed) 3000

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plugin vrsn: 1.2.5
WP vrsn : WordPress 5.2.5 ( not the latest! )

I want to upgrade my WP, but first i wish to make a full backup ( but can’t with your current plugin. Past backups are showing, however.

please advise. thanks!