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There are now several different permutations of backup file that can be created (i.e. online, rename, with/without secrets). Hopefully the admin users would organize their backup files sensibly, but it can't hurt to keep track of what the backup-file actually contains in a simple human-readable file within the backup tar. E.g. We really don't want backups with secrets-included and secrets-excluded getting mixed up. Recording the DC used to make the domain backup may be useful in the event of a catastrophic failure of the domain, e.g. DC replication may have been broken for some time prior to the failure. Recording the samba-tool version string may also be useful if there are ever any backwards-compatibility issues introduced to the backup files. The intention is to say we only support restoring a backup with the same version of samba-tool that actually created the backup, however, it'd be polite to users to actually record that version somewhere. Signed-off-by: Tim Beale <timbeale@catalyst.net.nz> Reviewed-by: Gary Lockyer <gary@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>