@alilly Consider ".linux.xz~"
Explanation:
• Unlike FAT32, the inferior ext4 doesn't have a +S attribute. Marking the file "hidden" is the closest alternative.
• I read https://www.nongnu.org/lzip/xz_inadequate.html. (Well, I read the title.) I'm not sure what "inadequate" means, but I'm guessing it's like inflammable. So make sure to rename everything to xz for archiving.
• If you shut down your computer, the kernel image is needed to bring it back up. A trailing ~ signifies a backup file.