-Explanation: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=819978
-Package: tar
+Explanation: tar, cuz https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=819978
+Explanation: kernel & btrfs-tools, because btrfs is getting a lot of active
+Explanation: dev, and their mailing list says better to use recent version
+Explanation: to avoid bugs. linux-base is needed for the kernel,
+Explanation: which you can find out by failing
+Explanation: apt-get install linux-image-amd64/jessie-backports
+Explanation: And then trying aptitude -s install, or
+Explanation: apt-get -t jessie-backports install linux-image-amd64
+Explanation:
+Explanation:
+Package: tar linux-image-amd64 linux-base btrfs-tools
Pin: release a=jessie-backports
Pin-Priority: 500
+
+Package: *
+Pin: release a=testing
+Pin-Priority: -10
+
+Package: *
+Pin: release a=testing-updates
+Pin-Priority: -10