Hello there!
I have an old Lumia 640 LTE. Recently I decided to turn it on again and I installed an update, so my current OS is Windows 10 (v.1703, build 10.0.15063.1868). I heard about this app making backups for apps and I want to backup some of my apps, including WhatsApp. Unfortunately, it seems not to work properly.
I correctly setup everything, since other apps, like Telegram, backupped, without any problems. WhatsApp appears to be "always calculating" the size. Even if I'll press the "Backup" button, it will close itself eventually, after some time. I read about some problems with x50 devies, but mine is a 640, so it's not a problem. I read also about a problem with BIG apps, and my Whatsapp is like 800MB, described here:
But I found no answers.
I followed instructions on the app Interop Tools for unlocking device, and the only thing I I noticed is that the "checkbutton" on the Interop/Cap unlock turns off randomly.
What the problem could be so? Can I backup in some way my WhatsApp?