diff --git a/proxmox-rrd/tests/file_format_test.rs b/proxmox-rrd/tests/file_format_test.rs
new file mode 100644
index 00000000..cecb242d
--- /dev/null
+++ b/proxmox-rrd/tests/file_format_test.rs
@@ -0,0 +1,59 @@
+use std::path::Path;
+use std::process::Command;
+
+use anyhow::{bail, Error};
+
+use proxmox_rrd::rrd::RRD;
+use proxmox::tools::fs::CreateOptions;
+
+fn compare_file(fn1: &str, fn2: &str) -> Result<(), Error> {
+
+    let status = Command::new("/usr/bin/cmp")
+        .arg(fn1)
+        .arg(fn2)
+        .status()
+        .expect("failed to execute process");
+
+    if !status.success() {
+        bail!("file compare failed");
+    }
+
+    Ok(())
+}
+
+const RRD_V1_FN: &str = "./tests/testdata/cpu.rrd_v1";
+const RRD_V2_FN: &str = "./tests/testdata/cpu.rrd_v2";
+
+// make sure we can load and convert RRD v1
+#[test]
+fn upgrade_from_rrd_v1() -> Result<(), Error> {
+
+    let rrd = RRD::load(Path::new(RRD_V1_FN))?;
+
+    const RRD_V2_NEW_FN: &str = "./tests/testdata/cpu.rrd_v2.upgraded";
+    let new_path = Path::new(RRD_V2_NEW_FN);
+    rrd.save(new_path, CreateOptions::new())?;
+
+    let result = compare_file(RRD_V2_FN, RRD_V2_NEW_FN);
+    let _ = std::fs::remove_file(RRD_V2_NEW_FN);
+    result?;
+
+    Ok(())
+}
+
+// make sure we can load and save RRD v2
+#[test]
+fn load_and_save_rrd_v2() -> Result<(), Error> {
+
+    let rrd = RRD::load(Path::new(RRD_V2_FN))?;
+
+    const RRD_V2_NEW_FN: &str = "./tests/testdata/cpu.rrd_v2.saved";
+    let new_path = Path::new(RRD_V2_NEW_FN);
+    rrd.save(new_path, CreateOptions::new())?;
+
+    let result = compare_file(RRD_V2_FN, RRD_V2_NEW_FN);
+    let _ = std::fs::remove_file(RRD_V2_NEW_FN);
+    result?;
+
+    Ok(())
+}
diff --git a/proxmox-rrd/tests/testdata/cpu.rrd_v1 b/proxmox-rrd/tests/testdata/cpu.rrd_v1
new file mode 100644
index 00000000..99d43d34
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diff --git a/proxmox-rrd/tests/testdata/cpu.rrd_v2 b/proxmox-rrd/tests/testdata/cpu.rrd_v2
new file mode 100644
index 00000000..5e4dfc77
Binary files /dev/null and b/proxmox-rrd/tests/testdata/cpu.rrd_v2 differ