|Feb 18, 2013, 07:12 PM||#1|
Using "rsync" for differential backups...
I'm sure this is old hat to many of you, but I've promised to give some examples of the use of rsync and its remote update protocol. The following commands perform a few differential backup tasks and should serve as examples for your own rsync backups. Of course, there are numerous other ways of using the rsync commands, but these are a few of the ways that I find useful.
Note: Since I use different non-standard ports for my secure shell (SSH) servers on different machines, I have to set the proper SSH ports in the rsync commands. If you use the standard port of 22, you will not need to specify the port (-p) on the ssh command.
Two machines: server.private and har.private.
SSH on server.private uses port YYYYY.
SSH on har.private uses port XXXXX.
Two primary repository directories: server.private:/Users/switon/Repositories and server.private:/Shared Items/Repos/Repos are to be cloned.
The subversion repositories contained in these two directories are to be cloned to three volumes: SC-MyPassport/Repos and SCPegasus mounted on har.private, and SCDrobo mounted on server.private using the rsync Terminal commands from har.private:
# Use rsync on har.private to backup repositories from server.private to har.private: rsync --rsh='ssh -pYYYYY' -avz server.private:/Users/switon/Repositories /Volumes/SC-MyPassport/Repos rsync --rsh='ssh -pYYYYY' -avz 'server.private:/Shared\ Items/Repos/Repos' /Volumes/SC-MyPassport/Repos rsync --rsh='ssh -pXXXXX' -avz /Volumes/SC-MyPassport/Repos /Volumes/SC-Seagate rsync --rsh='ssh -pXXXXX' -avz /Volumes/SC-MyPassport/Repos /Volumes/SCPegasus
Two volumes mounted on a different machine.
The "rsync" command cannot copy between two drives mounted on a different machine, so in this case I first ssh to the other machine in order to perform the "rsync" commands from the other machine:
# SSH to server.private to rsync between two drives mounted on server.private: ssh -pYYYYY firstname.lastname@example.org rsync --rsh='ssh -pYYYYY' -avz /Users/switon/Repositories /Volumes/SCDrobo/Repos cd /Shared\ Items/Repos rsync --rsh='ssh -pYYYYY' -avz '/Repos' /Volumes/SCDrobo/Repos
Backup iTunes Library from local machine to shared volume.
To backup videos in an iTunes library named iTunes-Videos from har.private to the shared volume SCDrobo mounted on server.private:
# Backup iTunes-Videos from har.private to shared volume SCDrobo mounted on server.private: rsync --rsh='ssh -pXXXXX' -avz 'har.private:/Volumes/SC-MyPassport/Videos/iTunes-Videos' /Volumes/SCDrobo/Videos
# Backup the iTunes-Videos library to SC-Seagate and SDPegasus: rsync --rsh='ssh -pXXXXX' -avz /Volumes/SC-MyPassport/Videos/iTunes-Videos /Volumes/SC-Seagate/Videos rsync --rsh='ssh -pXXXXX' -avz /Volumes/SC-MyPassport/Videos/iTunes-Videos /Volumes/SCPegasus/Videos
`Archived' means that ownerships and permissions and links are preserved, `checksummed' means that the original and backup copies are identical, and `compressed' means that the least amount of data is communicated over the network.
Of course, you must have to appropriate permissions to perform the Reads and Writes to each of these volumes. Sometimes you may encounter a situation where you do not have the proper permission to allow an rsync write in one direction, but then at these times you can often log into the other machine and use "rsync" from it to perform the backup (a "pull" instead of a "push" rsync).
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