explicit brance name

code/backup_rsync_git.sh

@@ -44,7 +44,7 @@ repo_abs="$(cd "$RSYNC_TARGET_DIR" && pwd)"
 rel_target="."
 
 if [[ ! -d "$repo_abs/.git" ]]; then
-  git -C "$repo_abs" init >/dev/null
+  git -C "$repo_abs" init -b main >/dev/null
 fi
 
 git_target() {