Schedule Backup
To schedule number of backup, You can manage as follows.
Manage Schedule Backups
Step 1. Go to Admin Tools > NS Backup
Step 2. Click on “Schedule Backup” button

Add New Schedule Backup
Step 1. To add new schedule backup, Click on “Schedul Backup” button
Step 2. Enter your backup name
Step 3. Choose what do you want to backup, like Backup-Everything, Database etc.
Step 4. Setup Schedule/Cron, You can easily get Cronjob setup from https://crontab.guru/ and Enter Start-date and End-date & time.
Step 5. Select your configured server/cloud and click-on “Submit Schedule Backup” button.

Run Backup: From TYPO3 Core Scheduler

Step 1. Go to System > Scheduler
Step 2. You can see all your scheduled tasks.
To schedule backup works better, We highly recommend to run the scheduler from here.
Attention
We have integrated TYPO3-core scheduler TYPO3 Symfony Console Command which is only available in TYPO3 v9 and above. Checkout https://forge.typo3.org/issues/85990
For TYPO3 v8, You can not use TYPO3 Backend Scheduler, You should use TYPO3-CLI to run the scheduler backup.
Run Backup: From TYPO3-CLI
If you have bigger size TYPO3-website, then we recommend to take backup from Command-line TYPO3-CLI.
Step 1. Go to your Command-line/Terminal.
Step 2. Run the following command
Syntax: <php-path> <typo3-bin-path> nsbackup:scheduler <id>
Example: /usr/bin/php typo3/sysext/core/bin/typo3 nsbackup:scheduler 2

Cronjob for TYPO3 v9 and v10
You should configure Cronjob at your server as follows.
crontab -e
*/15 * * * * /usr/bin/php /var/www/html/typo3/sysext/core/bin/typo3 scheduler:run
Tip
Know more about cronjob TYPO3 scheduler setup at https://docs.typo3.org/c/typo3/cms-scheduler/master/en-us/Installation/CronJob/Index.html
Cronjob for TYPO3 v8
Because, Scheduler with Syfony console integration feature not available in TYPO3 v8. So, You should add manually your each scheduled cronjob with UID as like below examples.
crontab -e
*/15 * * * * /usr/bin/php /var/www/html/typo3/sysext/core/bin/typo3 nsbackup:scheduler 1
0 */2 * * * /usr/bin/php /var/www/html/typo3/sysext/core/bin/typo3 nsbackup:scheduler 2
0 10 * * 5 /usr/bin/php /var/www/html/typo3/sysext/core/bin/typo3 nsbackup:scheduler 3