diff --git a/src/rtems_proxy/copy.py b/src/rtems_proxy/copy.py
index 19eb3ec..16be849 100644
--- a/src/rtems_proxy/copy.py
+++ b/src/rtems_proxy/copy.py
@@ -17,20 +17,23 @@ def copy_rtems():
     root = GLOBALS.RTEMS_ROOT
     # root of the path that the RTEMS IOC expects to find the IOC files
     rtems_root = Path("/iocs") / GLOBALS.IOC_GROUP / GLOBALS.IOC_NAME
-    # the binary blob to load into the RTEMS IOC via TFTP
-    ioc_bin = (GLOBALS.IOC / "bin") / GLOBALS.EPICS_TARGET_ARCH / "ioc.boot"
     # where to copy the Generic IOC folder to (at present only holds the dbd folder)
     dest_ioc = root / "ioc"
+    # where to copy the generated runtime assets to (st.cmd and ioc.db)
+    dest_runtime = root / "runtime"
 
-    # because we are moving the ioc files we need to fix up startup script paths
-    startup = GLOBALS.RUNTIME / "st.cmd"
-    cmd_txt = startup.read_text()
-    cmd_txt = re.sub("/epics/", f"{str(rtems_root)}/", cmd_txt)
-    startup.write_text(cmd_txt)
+    # clean up previous IOC binaries
+    shutil.rmtree(dest_ioc, ignore_errors=True)
+    shutil.rmtree(dest_runtime, ignore_errors=True)
 
     # move all the files needed for runtime into the PVC that is being shared
     # over nfs/tftp by the nfsv2-tftp service
     Path.mkdir(dest_ioc, exist_ok=True)
     shutil.copytree(GLOBALS.IOC / "dbd", dest_ioc, symlinks=True, dirs_exist_ok=True)
-    shutil.copytree(GLOBALS.RUNTIME, root / "runtime", dirs_exist_ok=True)
-    shutil.copy(ioc_bin, root)
+    shutil.copytree(GLOBALS.RUNTIME, dest_runtime, dirs_exist_ok=True)
+
+    # because we moved the ioc files we need to fix up startup script paths
+    startup = dest_runtime / "st.cmd"
+    cmd_txt = startup.read_text()
+    cmd_txt = re.sub("/epics/", f"{str(rtems_root)}/", cmd_txt)
+    startup.write_text(cmd_txt)