== `sqlite/backup.hpp`
[#backup]

Backup is a small wrapper function to create a backup of one database into another.
This can be useful to write an in memory database to disk et vice versa.

[source,cpp]
----
void
backup(connection & source,
       connection & target,
       cstring_ref source_name = "main",
       cstring_ref target_name = "main");

void
backup(connection & source,
       connection & target,
       cstring_ref source_name,
       cstring_ref target_name,
       system::error_code & ec,
       error_info & ei);
----


source:: The source database to backup

target:: The target of the backup

source_name:: The source database to read the backup from. Default is 'main'.
target_name:: The target database to write the backup to.  Default is 'main'.


.Example
[source,cpp]
----
sqlite::connection conn{sqlite::in_memory};
{
    sqlite::connection read{"./read_only_db.db", SQLITE_READONLY};
    // read peristed data into memory.
    backup(read, target);
}
----