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Schedule a .mac backup at a precise time Internet
The relatively new .mac Backup program can be scheduled to run during any of the 12 two-hour windows given in the Schedule dialog window. The time that is chosen within the two hour window is random. Any time you choose to reschedule, a new random time will result. This means you have no clue as to when precisely the Backup will run. According to a response I had in an Apple .mac forum, this is designed specifically this way to spread the workload on the Apple iDisk server machine(s).

You can take control however and specify *precisely* when the Backup will execute. To do this, one has to edit the crontab entry that Backup creates. The crontab entry can be edited via use of the Terminal.app UNIX command crontab -e'. For example, to schedule the Backup to run precisely at 4am then the crontab entry would look like the following:
0 4 * * * "/Applications/Backup.app/Contents/MacOS/Backup"
-backupNow >/tmp/backuplog.0005949 2>&1
NOTE: Shown on two lines for a narrower dispay width; enter as one line.

The "/tmp/backuplog.0005949" can be anything you choose. This is the command for performing a Backup-to-iDisk. I leave it to others to discover how this same operation can be done for a Backup-to-CD (CD-R or CD-RW) or Backup-to-DVD (DVD-R).
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Whitespace, tabs not required
Authored by: ret on Sep 07, '02 01:32:02AM

In crontab entries, the fields are separated by whitespace - one or more spaces and/or tabs.

FWIW the fields in the crontab entry define
minute(s) hour(s) day(s)-in-month month(s) day(s)-of-week "command"

cheers
RET



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Schedule a .mac backup at a precise time
Authored by: Garin on Mar 09, '04 10:53:35PM

Alas, this does not work for Backup 2.

I have NO idea how Backup runs on Panther, because it doesn't appear to be in my crontab. I found the preference setting but I'm not sure what reads that pref to execute.

Man, do I ever wish I could find it. My Backup fires up three or four times in a row within a few seconds at the scheduled time. I really wish I could fix it.



[ Reply to This | # ]
Schedule a .mac backup at a precise time
Authored by: nikster on Nov 16, '07 02:18:59AM

I want this, but Backup 3 does not store an entry in crontab.

I find it amazing that I enter 06:30 as my backup time, and get completely random backup times in return.

My history shows this:
16:58
20:44
7:53
7:43
6:33
7:16

None of these were manually started. It seems like Backup.app starts whenever it wants. WTF??



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