Backup using rsync
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Rsync is a software tool used to perform disk backups either locally or remotely. It performs differential synchronization, only copying files that have changed, to save bandwidth. Rsync can be used to create archives including permissions and metadata, specify remote shell connections like SSH, filter files, compress data transfers, update existing backups by only sending changed files, and delete files from the destination that no longer exist in the source.
Backup using rsync
- 1. Gaurav Mishra <gmishx@gmail.com> Linux - 9 Backup using rsync Unrestricted 01-03-2018
- 2. Gaurav Mishra <gmishx@gmail.com> rsync • rsync is a software in Linux environment use to make disk backups. • Backups can be either local or on remote machine. • The uniqueness of rsync is that it performs differential synchronizations. • Both the systems must have rsync installed. • rsync can use ssh secure connections for transmissions. 01-03-2018
- 3. Gaurav Mishra <gmishx@gmail.com> Using rsync • Install rsync on remote and local machine ▫ sudo apt-get install rsync • Creating archive on remote host ▫ Archive mode include recursive copy, sym links, permissions, time, group, owner and device files. rsync -r -a -v ~/proj user@host:~/backups/ • Specifying remote shell ▫ Additional information for the remote shell used to setup connection can be set using -e flag ▫ Setting the ssh port during transfer rsync -rav -e ‘ssh -p 2257’ ~/proj user@host:~/backups/ • Filtering files ▫ rsync can filter files to be copied using filter rules ▫ Filtering ‘.o’ files rsync -rav --exclude=“*.o” ~/proj user@host:~/backups/ 01-03-2018
- 4. Gaurav Mishra <gmishx@gmail.com> Using rsync • Performing compression on transmission ▫ rsync can compress the transmission to save bandwidth rsync -z -r ~/project user@host:~/backups/ • Updating a backup ▫ Using update options, rsync will not transfer files which are new in the destination rsync -av <-u/--update> ~/project user@host:~/repository/ • Deleting old files ▫ rsync support delete option which removes files from the destination which are not in the source ▫ To use this option, whole directory must be synchronized rsync -a --delete ~/project user@host:~/repository/ 01-03-2018