Backup
See Ubuntu Help for details.
# Full root file system backup
tar -cvpzf backup.tar.gz --exclude=/backup.tar.gz --one-file-system /
# Backup remote file system (SSH)
ssh root@srv.local -p 22 "tar -cvpz --one-file-system /" > srv-backup.tar.gz
# Restore
tar -xvpzf /path/to/backup.tar.gz -C /media/whatever --numeric-ownerOther useful commands
# Remove compression from tar.gz
gzip -dk archive.tar.gz
# Compress directory
tar -zcvf myfolder.tar.gz myfolder
# Read gzipped log
zcat error.log.2.gz