tar file without remove existing data
 

I want to use tar command to backup file ,( tar -cvf device file ) , but I found that if I use this command , it will overwrite / remove the existing data in the tape ( the data is created by other tools , not tar ) , can advise how can I keep the existing data if I use tar backup ? thx

Try the -A or -r options. See man tar

try tar -xvf <your tar file>

thx reply ,

but the existing is made by other backup tool , the -A -r is to append new backup file to the tar file ? if yes , what can I append the new backup file to existing data ? thx