# 5. Data Safety 🔐

All changes made using Exchange and Graph are:

• Pre-validated
• Logged in .Logs\
• Cached locally for rollback
• Backed up with JSON snapshots
• Restorable from backup

This ensures that, in the event you make a mistake, you have a last known good config to restore from, and/or can understand exactly what changes were made and walk them back manually if you wish.

Further, when a resource is decomissioned - it is never deleted. It is simply removed from the Global Address List (GAL), to ensure that existing bookings still assigned to it can be shown, and utilisation statistics are available.