When your SelBuk plan does not have a cloud server account, you should save full backups of your data on a computer on a frequent basis. To create a full Backup of your data from iPhone or iPad:

On the main menu press the More icon.

More > Sync 

Local > 

Create Backup > select the option (Create backup with images) 

Local > Export Files > Wi-Fi > Backup > write on your web browser the address given to download the “Last_Backup.sbk" file to the desktop or laptop computer. 

Export Files > Email > Backup > select the file "Last_Backup.sbk" and send it to your own e-mail address

Remarks: The systems creates a backup every 24 hours. Make sure that you have saved the “Last_Backup.sbk” on the computer. The file "Last_Backup.sbk" has the data on the last 24 hours. Additionally, you may see other backups with the label "Backup_" and the date of creation.

if you need to import or restore a backup on your mobile device see more info