How to make an online backup of my system disk
I have a noob question and I hope you may help me.
I have a debian file server and I have no monitor or keyboard I can use to access the machine. I only log in via ssh from my laptop.
Now, what I would like to do is making a backup of the system disk (about 16 Gb).
considering that my system boots from sda, do you think I could simply switch to runlevel 1 and do "dd if=/dev/sda | gzip [...]" and have a correct backup?
Otherwise I could use dd to backup only MBR and then tar to backup "/", but I'd prefer the first option.
However, I think switching to runlevel 1 could be useful to prevent too many writes on disk during the backup. What do you think?
since the ssh server is down at runlevel 1, I was thinking I could use a serial link to control the machine from my laptop. Do you think it's possible to have a serial console running at runlevel 1?
Would it be correct if I add "T0:123:respawn:/sbin/getty -L ttyS0 115200 vt100" to /etc/inittab?
Thank you very much for your help.