Tabular Read Only Mode

Hi Experts,

Read-Only Model

1. What is the advantage of Tabular Model readonly mode?
2. Does it offer better Query Performance?
3. If the Model is changed to Read Only mode - can we still restore a new version without downtime

Synchronize vs Back-up Restore

1. What is the difference. Does Synchronize does the backup restore internally?
2. How to decide between Synchronize or BackUp restore

Regards

kart