Hack-A-N900/Rsnapshot
Before tinkering with your N900 you should always create a backup. anyway, currently there is no full backup solution provided for maemo fremantle. But hey, it's a linux box. ;)
I'm using rsnapshot to create regular as well as manual backups of my N900 root fs. Using rsnapshot, it is possible to take snapshots of your filesystems at different points in time. Using hard links, rsnapshot creates the illusion of multiple full backups, while only taking up the space of one full backup plus differences. When coupled with ssh, it is possible to take snapshots of remote filesystems as well.
Make sure to read the manual of rsnapshot.
Prerequisites
Install rsnapshot on your PC
Install rsync on your N900
apt-get install rsync
Edit /etc/rsnapshot.conf on your PC
Entries i changed:
snapshot_root /.snapshots/ cmd_cp /bin/cp cmd_rm /bin/rm cmd_rsync /usr/bin/rsync cmd_ssh /usr/bin/ssh cmd_du /usr/bin/du cmd_rsnapshot_diff /usr/bin/rsnapshot-diff ######################################### # BACKUP INTERVALS # # Must be unique and in ascending order # # i.e. hourly, daily, weekly, etc. # ######################################### # target for manual backups - rotate 50 snapshots interval manual 50 # targets for regular backups interval hourly 6 interval daily 7 interval weekly 4 # ssh private key for my n900 ssh_args -i /home/elchaschab/.ssh/id_rsa_n900 du_args -csh # backup only root partition. no special fs. one_fs=1 prevents spanning across file systems backup root@minime:/boot minime/ backup root@minime:/cdrom minime/ backup root@minime:/etc minime/ backup root@minime:/home minime/ one_fs=1 backup root@minime:/initrd minime/ backup root@minime:/lib minime/ backup root@minime:/root minime/ backup root@minime:/sbin minime/ backup root@minime:/srv minime/ backup root@minime:/syspart minime/ backup root@minime:/usr minime/ backup root@minime:/var minime/ one_fs=1
Configure automatic backup
I added following to my /etc/crontab:
0 */4 * * * /usr/local/bin/rsnapshot hourly 50 23 * * * /usr/local/bin/rsnapshot daily 40 23 * * 6 /usr/local/bin/rsnapshot weekly
6 hourly backups a day (once every 4 hours, at 0,4,8,12,16,20)
1 daily backup every day, at 11:50PM
1 weekly backup every week, at 11:40PM, on Saturdays (6th day of week)
Usage
Trigger manual backup on your PC:
sudo rsnapshot -v manual
Diff two snapshots
sudo rsnapshot -v diff manual.0 manual.2
