resilient: export happen once a day, with a random date defined on 1st buildout run.

This solution is better than adding a sleep in a crontab, because it will be a new
date every day

stack/resilient/buildout.cfg

@@ -59,7 +59,7 @@ mode = 0644
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/pbsready-export.cfg.in
 output = ${buildout:directory}/pbsready-export.cfg
-md5sum = cb2537598981a1a4af0dea05cc6ac6bd
+md5sum = 031fb7785cd5e99c2d794fa7e00e5190
 mode = 0644
 
 [template-pull-backup]

stack/resilient/pbsready-export.cfg.in

@@ -77,11 +77,9 @@ rendered = $${basedirectory:promises}/exporter-status
 recipe = slapos.cookbook:cron.d
 name = backup
 frequency = $${slap-parameter:resiliency-backup-periodicity}
-# Sleep from 1 to 6 hours before backing up (disks/network IO optimization)
-sleep-command = ${bash:location}/bin/bash -c "sleep $((RANDOM%(60*60*6)))"
-command = ($${:sleep-command}; $${notifier-exporter:wrapper} --transaction-id `date +%s`)
+once-a-day = true
+command = $${notifier-exporter:wrapper} --transaction-id `date +%s`
 
 [slap-parameter]
 # In cron.d format (i.e things like */15 * * * * are accepted).
-resiliency-backup-periodicity = 0 0 * * *
-
+resiliency-backup-periodicity =