Warning for new Insider Preview 15031 - Microsoft Community

do not , mean under circumstances update on dual boot machine. can prevent this. 

i have gotten update because of forced restart of anniversary update.

and erased 150gb of partitions of hdd , destroyed every other partition left. 

check pictures taken. had 150gb in 3 ext4 partitions. of "free space"..... **** microsoft.....

and every 1 of ntfs partitions destroyed. 

if has idea rescue data welcoming it. there many important documents. on non-windows partitions, since need stability working.

and wasn't on earliest updates. on late branch of previews. 

microsoft need these forced restarts. working not possible on this.....

"forced restart of anniversary update"  sorry that's an old build on creators build number 15031 have dual boot systems , have had no issues, using insiders/preview comes warnings crashing, deleting files. 

Windows Insider Program / Windows Insider Preview / Repair and recovery / PC