paloprisk on "[Plugin: UpdraftPlus - WordPress Backup and Restoration] Backup stuck while saving database"

Hi David,
I am back ... it's been kinda long time, but I'm back.
Actually, my hosting company is so reluctant to support its customers that I decided to do TWO things :
#1 - increase memory allowance to WP plugins in my php.ini
#2 - download the latest version of UpdraftPlus (1.8.8)
And so far ... so good (see pic) !
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One question though : how can I make sure this dB backup is coherent ?
I tried to DL it and open it with 7zip but to no avail, even after I renamed it .tar or .gz.
How can I read this file "easily" to double-check it ?
Thanks.
Yann