Use this Techsupport with a periodicle trigger to your need. 
This will create a zip file in the sdk flash space. with a timestampe in the filename. 
You can download the file via scp.

<code c techsupport-local-backup.are >

now = localtime(time());
timestamp = strftime("%Y%m%d%H%M%S", now);
printf("%s",timestamp);
file_copy("/host/various/techsupport",sprintf("ts_%s.zip",timestamp));

</code>