Debian / Ubuntu Linux Install and Configure Remote Filesystem Snapshot with rsnapshot Incremental Backup Utility

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I would like to configure my Debian box to backup two remote servers using rsnapshot software. It should make incremental snapshots of local and remote filesystems for any number of machines on 2nd hard disk located at /disk1 ( /dev/sdb2). How do I install and use rsnapshot on a Ubuntu or Debian Linux server?

Mac OS X Remove SSH Known Host

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I‘ve reinstalled Linux on remote server and now trying to connect it over ssh using Mac OS X:

ssh user@server1.example.com

But I’m getting an error which read as follows:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.
Please contact your system administrator.
Add correct host key in /Users/user/.ssh/known_hosts to get rid of this message.
Offending key in /Users/user/.ssh/known_hosts:1
RSA host key for server1.example.com has changed and you have requested strict checking.
Host key verification failed.

How do I fix this problem under Mac OS X?

Turn on telnet server on Debian Linux

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Q. How do I install and turn on telnet server on Debian Linux VPS Server?

A. I don’t recommend using telnet at all on VPS or any other Linux / UNIX server. Telnet transfers all data including passwords in clear text format. It is recommended that you use ssh which is installed by default.

Use ssh and connect to remote server called boo.myvps.com, enter:
ssh user@boo.myvps.com
ssh root@boo.myvps.com
ssh root@server-ip-address

In case you still need telnet, type the following two commands (not recommended
# apt-get install telnetd
# /etc/init.d/inetd restart
$ telnet server-ip-address