I have an iPhone 6s, fully updated. Starting from 20 December, whatsapp complains that there is not enough space on the iphone to do a backup to icloud. Before this date, everything worked fine and I don't remember doing anything particular around that time.
The backup dimension is 2.37 Gb with 878 Mb of videos. Currently I have 8.2 Gb of free space on my phone (and 40 Gb on iCloud), but whatsapp complains that I should "free 512 MB of space on the phone to do chat backup".
So, I have two questions:
1 - Why does the backup require any additional space at all? The 2.37Gb are already stored locally inside the whatsapp app; why would I need any additional space for the icloud backup?
2 - Why does it require so much more space? Is there something wrong?