Some times you need to set your sitecollection(s) as read-only, for example, before backup.
Via Central Admin:
- Go to Centeral Admin
- Application Management
- Site Collection Quotas and Locks
- Read-only (blocks additions, updates, and deletions)
Using SQL Server Database by setting the database as read-only.
- Open SQL Server Management Studio
- Right click on your site collection database and choose Properties
- Click on Options