Monthly optical data backups in addition to hard drive backups create an extra level of insurance for me in the event of hardware failure.
With ext3, you can reconstruct (many) deleted files based on entries from the filesystem journal.
We found a way to create secure, space-efficient remote backups with Duplicity. It supports AWS S3 and other kinds of remote storage with compression and encryption.
Make a bootable backup of your hard drive so that you can quickly recover in the event of a hard drive failure and maintain your productivity.