What are the .# files in $GNUPGHOME?

Hello! I use gpg on linux and I noticed that there are some hidden files in my $GNUPGHOME directory. Their name follows the following pattern:

I noticed them because I version control the directory my $GNUPGHOME with git (obviously, I don’t push it anywhere, but I can say it can saved me from being an encryption idiot and losing keys).

What are these files? What do they do? Are they important? Should I back them up? Thank you!

These are lock files which the gnupg processes use internally to signal between themself who owns a resource. They should be automatically removed in theory, but sometimes things do not work as they should and they are left over.
You can safely delete them.

Thank you for your help!