How to make auto snapshot on Linux?

 how to set bash with time in Linux

How to take snapshots in VirtualBox using sh file

How to take snap

now set take snapshot and delete snapshot automatically 
we can set time frame or schedule for that

01 type cd  /usr/bin

then showing like this 

02 type sudo nano add1.sh

 

#!/bin/bash 

sleep   `echo $(VBoxManage snapshot "lubuntu64 bits" take "now")` # Place your code>

sudo chmod +x add1.sh

./add1.sh

that way make take snapshot using sh on linux 

now we try make delete snapshot using sh 

sudo nano delete1.sh

 sleep `echo $(VBoxManage snapshot "lubuntu64 bits" delete "now")` # Place >

after run

sudo chmod +x delete1.sh

./delete1.sh

now we made a schedule using these two sh 

make new sh call summary.sh

sudo nano summary.sh

after 

sudo echo "/usr/bin/add1.sh" | at 1:00Am

sudo echo "/usr/bin/add1.sh" | at 2:00Am

sudo echo "/usr/bin/add1.sh" | at 3:00Am

sudo echo "/usr/bin/add1.sh" | at 4:00Am

sudo echo "/usr/bin/add1.sh" | at 5:00Am

sudo echo "/usr/bin/add1.sh" | at 6:00Am

sudo echo "/usr/bin/add1.sh" | at 9:00Am

sudo echo "/usr/bin/add1.sh" | at 12:00pm

sudo echo "/usr/bin/add1.sh" | at 3:00pm

sudo echo "/usr/bin/add1.sh" | at 6:00pm

sudo echo "/usr/bin/add1.sh" | at 9:00pm

sudo echo "/usr/bin/delete1.sh" | at 1:05Am

sudo echo "/usr/bin/delete1.sh" | at 2:05Am

sudo echo "/usr/bin/delete1.sh" | at 3:05Am

sudo echo "/usr/bin/delete1.sh" | at 4:05Am

sudo echo "/usr/bin/delete1.sh" | at 5:05Am

sudo echo "/usr/bin/delete1.sh" | at 6:05Am

sudo echo "/usr/bin/delete1.sh" | at 9:05Am

sudo echo "/usr/bin/delete1.sh" | at 12:05pm

sudo echo "/usr/bin/delete1.sh" | at 3:05pm

sudo echo "/usr/bin/delete1.sh" | at 6:05pm

sudo echo "/usr/bin/delete1.sh" | at 9:05pm

copy the above time schedule you can change it as you want 

sudo chmod +x summary.sh

if you show an error then you should install at as bellow 

sudo apt install at

now work our at command

./summary.sh

Now how to set this work as a loop on everyday 

try this way 

sudo nano everyday.sh

#!/bin/bash

while ( true ); do

  before=`date +%s`

  sleep `echo "/usr/bin/summary.sh" | at 11:16pm` # Place your command here

  after=`date +%s`

  DELAY=`echo "86400-($after-$before)" | bc`

  sleep $DELAY

done

after 

sudo chmod +x everyday.sh

after 

./everyday.sh

As you can see it will take autos a nap and it will delete old snap auto using our bash 

when deleting a snap it always delete 1st snap it means old snap, not any way delete the latest snap, that will match your aim

 
if you have any issues message us we will help you

thank you