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Checking your backup is correct before rebooting

Make a copy of mydata.tgz

Let us pretend you have made a change to a system file, click on cpanel and clicked on backup….to backup the correct device.

Where is your backup file?

sudo find / -name mydata*

Then copy that file onto usb stick etc or email it to yourself attaching mydata.tgz.
Most email clients should show a date stamp so you can keep various emails and so various backups.
Include a summary of your changes in the subject line.

Quick way of viewing contents

sudo tar tzf /mnt/sda1/tce/mydata.tgz | less

Change sda1 to wherever the find command reports please