Advice & what not to do
Please follow these common sense rules to avoid any network abuse
Do not overload the websites! Downloading a site can overload it, if you have a fast pipe, or if you capture too many simultaneous cgi (dynamically generated pages).
Do not download too large websites: use filters
Do not use too many simultaneous connections
Use bandwidth limits
Use connection limits
Use size limits
Use time limits
Only disable robots.txt rules with great care
Try not to download during working hours
Check your mirror transfer rate/size
For large mirrors, first ask the webmaster of the site
Ensure that you can copy the website
Are the pages copyrighted?
Can you copy them only for private purpose?
Do not make online mirrors unless you are authorized to do so
Do not overload your network
Is your (corporate, private..) network connected through dialup ISP?
Is your network bandwidth limited (and expensive)?
Are you slowing down the traffic?
Do not steal private information
Do not grab emails
Do not grab private information
Source from: HTTrack Open Source offline browser