All u java gurus -please help me with my DAEMONS

I had already posted one query regarding the same but due to some unsatisfactory answers I am forced to ask the same question.
JUST TELL ME HOW TO WRITE DAEMONS IN JAVA- REST I WILL MANAGE
heres my problem:
I have to make a java program to backup and restore encrypted files over a network.
The daemon should :
1 . The daemon has to be able to send messages to all other comps in the network that a user on some machine wants to backup or restore a file.
2. It also needs to be able to find all the files backed up of others as well as my own files on my PC.
3. I will maintain files placed on each PC using hash tables for efficient searching.When this is done the daemon will figure out from a heap of free disk space how many comps are to be involved.I then use a TCPserver or TCPclient class to open connections to them and send or receive encrypted files.
4. Daemon will send messages across the network if any system change(disk space +/-) occurs.Can anyone give me some documentation and links on the same?
Yeah,one more thing how will that daemon calculate free disk space on my computer -any methods would be appeciated -This willl determine what computers to select for back up.
IF all the above doesnt make any sense just tell me how to write a daemon-I need the code for this.
Also how will ensure that my daemon will run at the same time a machine boots up.
help for any part will be appreciated

Check out the apache commons daemon library and associated stub program. http://jakarta.apache.org/commons/daemon/
AFAIK There's no quick way in the Java libraries of measuring free disk space. Best bet is to exec the appropriate command line utility and read the results programatically.

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Edited by: user12054715 on Aug 18, 2010 4:11 PM
Edited by: user12054715 on Aug 18, 2010 4:13 PM

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Srinivas,
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