AirGap

This application is intended to make a better protection for the backup files.
Modern cryptolockers can encrypt even remote files. AirGap is a Windows service that keeps specified files locked for writing, thus disallowing malware to alter them.

31/04/2017 - First idea.
7/05/2017 - 1.0 Release.


Usage:
On the backup storage machine install AirGap as a service from elevated command prompt:
sc create "AirGap" binPath= "C:\Program Files\AirGap\AirGap.exe"

In [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AirGap\Parameters] key define folders where files you want to lock and include/exclude masks:
"Folder0001"="D:\\Backup\\Daily"
"Include0001"="*.vbk; *.vbi"
"Exclude0001"="*.tmp; *.temp"

And finally start AirGap service:
sc start AirGap

When you need to remove old (or update) backup files - stop AirGap service, remove files and start service again.