One of the most important aspects of mirroring information from the Internet is updating your archives.
Downloading the whole archive again and again, just to replace a few changed files is expensive, both in terms of wasted bandwidth and money, and the time to do the update. This is why all the mirroring tools offer the option of incremental updating.
Such an updating mechanism means that the remote server is scanned in search of new files. Only those new files will be downloaded in the place of the old ones.
A file is considered new if one of these two conditions are met:
To implement this, the program needs to be aware of the time of last modification of both local and remote files. We call this information the time-stamp of a file.
The time-stamping in GNU Wget is turned on using ‘--timestamping’
(‘-N’) option, or through
timestamping = on directive in
.wgetrc. With this option, for each file it intends to download,
Wget will check whether a local file of the same name exists. If it
does, and the remote file is not newer, Wget will not download it.
If the local file does not exist, or the sizes of the files do not match, Wget will download the remote file no matter what the time-stamps say.