02-17-2009
It most likely has to do with resource competition - another process is using the disk, or has the cpu, whatever. Other times, you are first in line for all resources.
The only thing I know is to bump the priority of the process. Since you do not set A=1 in your code, it will loop forever. If it does that at a very high priority you have a BIG problem.
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LEARN ABOUT DEBIAN
backintime
backintime(1) USER COMMANDS backintime(1)
NAME
backintime - a simple backup tool for Linux.
This is command line tool. The graphical tools are: backintime-gnome and backintime-kde4.
SYNOPSIS
backintime [ --backup | --backup-job | --snapshots-path | --snapshots-list | --snapshots-list-path | --last-snapshot | --last-snapshot-path
| --help | --version | --license ]
DESCRIPTION
Back In Time is a simple backup tool for Linux. The backup is done by taking snapshots of a specified set of folders.
All you have to do is configure: where to save snapshots, what folders to backup. You can also specify a backup schedule: disabled, every
5 minutes, every 10 minutes, every hour, every day, every week, every month. To configure it use one of the graphical interfaces available
(backintime-gnome or backintime-kde4).
It acts as a 'user mode' backup tool. This means that you can backup/restore only folders you have write access to (actually you can backup
read-only folders, but you can't restore them).
If you want to run it as root you need to use 'su'.
A new snapshot is created only if something changed since the last snapshot (if any).
A snapshot contains all the files from the selected folders (except for exclude patterns). In order to reduce disk space it use hard-links
(if possible) between snapshots for unchanged files. This way a file of 10Mb, unchanged for 10 snapshots, will use only 10Mb on the disk.
When you restore a file 'A', if it already exists on the file system it will be renamed to 'A.backup.currentdate'.
For automatic backup it use 'cron' so there is no need for a daemon, but 'cron' must be running.
user-callback
During backup process the application can call a user callback at different steps. This callback is "$XDG_CONFIG_HOME/backintime/user-
callback" (by default $XDG_CONFIG_HOME is ~/.config).
The first argument is the progile id (1=Main Profile, ...).
The second argument is the progile name.
The third argument is the reason:
1 Backup process begins.
2 Backup process ends.
3 A new snapshot was taken. The extra arguments are snapshot ID and snapshot path.
4 There was an error. The second argument is the error code.
Error codes:
1 The application is not configured.
2 A "take snapshot" process is already running.
3 Can't find snapshots folder (is it on a removable drive ?).
4 A snapshot for "now" already exist.
OPTIONS
-b, --backup
take a snapshot now (if needed)
--backup-job
take a snapshot (if needed) depending on schedule rules (used for cron jobs)
--snapshots-path
display path where is saves the snapshots (if configured)
--snapshots-list
display the list of snapshot IDs (if any)
--snapshots-list-path
display the paths to snapshots (if any)
--last-snapshot
display last snapshot ID (if any)
--last-snapshot-path
display the path to the last snapshot (if any)
-h, --help
display a short help
-v, --version
show version
--license
show license
SEE ALSO
backintime-gnome, backintime-kde4.
Back In Time also has a website: http://backintime.le-web.org
AUTHOR
This manual page was written by BIT Team (<bit-team@lists.launchpad.net>).
version 1.0.10 Mars 2009 backintime(1)