

I don’t know about number one, but a few that I miss.
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freshmeat.net. Announcements of open source software releases and updates.
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newegg.com — computer components retailer — is still around, but it doesn’t hold the spot it once did.
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bash.org. Searchable list of funny, ranked quotes from IRC and similar. There are some archives, like this one.
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A few “hosting” sites that went down with a lot of user-created content. No one thing was amazing, maybe, but it produced a lot of dangling links. Geocities: “At least 38 million pages, most written by users, were displayed by GeoCities before it was terminated.[7] The GeoCities Japan version of the service lasted until March 31, 2019.[8]”. AngelFire. Tripod. Apparently the latter two are still around in some limited form.
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Kaleidoscope.net, a site featuring themes for the eponymous classic MacOS themeing software package. They did a good job of generating theme previews. Fun to browse through.
Yeah, if you want to use rsync specifically for backups, you’re probably better-off using something like
rdiff-backup, which makes use of rsync to generate backups and store them efficiently, and drive it from something likebackupninja, which will run the task periodically and notify you if it fails.rsync: one-way synchronizationunison: bidirectional synchronizationgit: synchronization of text files with good interactive merging.rdiff-backup:rsync-based backups. I used to use this and moved torestic, as thebackupninjatarget forrdiff-backuphas kind of fallen into disrepair.That doesn’t mean “don’t use
rsync”. I mean,rsync’s a fine tool. It’s just…not really a backup program on its own.