Thats a curious post.
You want to back up "all pc" on a network ,do you mean the OS on each pc or the data?
I would have thought the choice would be linux if it is only the data but it could be done to backup the system with it with a fairly simple "dd " copy in a script I suppose run regularly with "cron".
Fairly straight forward with linux but no idea if xp could do it , seems like it should be able to though.
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