*`SB_USER`: (e.g. `pete:letmein`) —this is **super important** otherwise your space will be open to anybody without any authentication
*`SB_AUTH_TOKEN`: (Optional) If you would like to migrate existing content from elsewhere (e.g. a local folder) using [[Sync]], you will want to configure an authentication token here (pick something secure).
If you want to migrate content _from_ or _to_ your new Deploy-based space, you can use [[Sync]]. For this be sure to also configure a `SB_AUTH_TOKEN` variable.
For backup purposes, it may be wise to synchronize your content regularly this way.