There are couple of documentations about backup and restore for Sandbox Tier 2+ and similar documentation about database copy for Sandbox Tier 1 to Tier 2, and vice versa.

It however doesn’t exit for specific to Sandbox Tier 1 environment backup and restore scenario. This is also important scenario for partners/customers to maintain their Finance and Operations database on DEV environment as their daily works.

Please publish a guidance officially so that they can operate backup/restore even on Tier 1 DEV environment with no worry.
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