How can I safely roll back a FileZilla site manager schema change without losing connection profiles?

After editing FileZilla's site manager XML (sitemanager.xml) to add custom fields or change the schema, I need a way to revert those changes if the file becomes invalid or causes connection profiles to disappear. The goal is to keep all existing site entries intact and usable after a rollback, without manually re‑entering data.

What is the recommended procedure to create a restorable backup of sitemanager.xml before editing? How can I verify that the backup can be restored without corrupting the site manager? Are there any built‑in FileZilla features or command‑line options that facilitate a safe rollback after a schema alteration?