If you store a backup on hard disk, the risk of rm -rf does exists.
Use chattr command changes the file attributes on a Linux second extended file system so that you will stay away from accidentally removing your backup files with rm -rf.
chattr command write protect the backup directory so that no one can delete it (including root). This is also known as making file immutable. For example your backup directory is /backup, type the following command to write protect directory /backup (only root can set or remove these flags):
# chattr -R +i /backup
To remove immutable flag, type the following command:
# chattr -R -i /backup
If you are using FreeBSD use chflags command to setup immutable flag:
# chflags -R schg /backup
To remove immutable flag, type the following command:
# chflags -R noschg /backup
These commands will keep you from accidentally removing your backup files with rm -rf :D
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