So I set out to complement Time Machine with a "simpler" back up. Not simpler to set up, granted, but simpler in the sense that it just copies files over to another disk. That's it. Just somewhere else.
So ... I stumbled upon this article describing out to use launchd to trigger a script when a "watched" folder's state changes. Their solution works great, here's how I implemented mine: same recipe, you will want a plist to kick the backup script and the backup script itself, using rsync.
I used ~/Documents/perso/com.arnaudlacour.osx.backup.plist and ~/Documents/perso/backup
That's because I'm going to use that to back up ~/Documents/perso to a USB disk called OPALE.
here's the plist:
Label com.arnaudlacour.osx.backup LowPriorityIO Program /Users/arno/Documents/perso/backup ProgramArguments backup OPALE WatchPaths /Volumes
And here is the backup script:
#!/bin/bash -llog=/var/log/com.arnaudlacour.osx.backupecho "`date` - starting back up to ${1}" >> $logfrom=~/Documents/persoto=/Volumes/${1}if ! test -z "$1" && test -e "${to}" ; then # WAIT some time until the disk is ready sleep 10
# Start rsync'ing to the target rsync -ahmuv --progress ${from} ${to} 2>&1 >> ${log}else echo "target [${to}] not valid" > ${log}
fi echo "`date` - done" >> ${log}then it is a simple matter of registering the plist in launchd
launchctl load ~/Documents/perso/com/arnaudlacour.osx.backup
When I then plug my USB drive and OSX mounts it, the script kicks in:
Sun Nov 11 16:38:18 MST 2012 - starting back up to OPALE
rsync -ahmuv --delete --progress /Users/arno/Documents/perso /Volumes/OPALE
building file list ...
37419 files to consider
sent 670.76K bytes received 20 bytes 268.31K bytes/sec
total size is 24.61G speedup is 36691.20
Sun Nov 11 16:38:31 MST 2012 - done
Incremental backup upon USB Drive plug-in
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