add comments to sync_files function

src/main.rs

@@ -113,6 +113,9 @@ fn get_current_hostname() -> Option<String> {
 }
 
 fn sync_files(config: &Config, from: &str, to: &str) {
+    // send first batch of files based on size alone
+    // works for media, since that doesn't change
+    // TODO: exclude database files entirely at this stage
     Command::new("rsync")
         .args(
             ["-rz",
@@ -128,6 +131,9 @@ fn sync_files(config: &Config, from: &str, to: &str) {
         .status()
         .expect("Failed to sync media files.");
 
+    // now this only includes database files
+    // this explicitly ignores size, as two databases can be the same "size" but may have different
+    // contents? i think that's why i wrote this lol
     Command::new("rsync")
         .args(
             ["-rzcv",