Quick fix for deleting old backups

+ This should be refactored in the future

src/backup.rs

@@ -252,7 +252,7 @@ fn get_time_from_file_name(
     archive_entry: &DirEntry,
 ) -> Result<Option<NaiveDateTime>, std::io::Error> {
     let file_name = archive_entry.file_name().to_str().unwrap().to_string();
-    let name: Vec<&str> = file_name.split('_').collect();
+    let name: Vec<&str> = file_name.split("_backup.tar.gz").collect();
 
     Ok(chrono::NaiveDateTime::parse_from_str(name[0], "%d-%m-%y_%H.%M.%S").ok())
 }