public async Task RemoveTargetAsync(IBackupSyncTarget target)
{
Guard.IsNotNull(target, nameof(target));
_targets.Remove(target);
var a = _targets.Items;
if (!a.Any())
{
await _cache.RemoveAsync("settings_backupSync_targets");
}
else
{
await _cache.InsertAsync("settings_backupSync_targets", a, _serializer).ConfigureAwait(false);
}
}