The other day I was able to delete 80gigs of dupicated files cause by copying and pasting on a GUI
Free and Open Source Software
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One more: Network shares vs. clowd storage fx M365 and Google drive. Often the ekstra functionality isn't needed and just adds complexity. Plus the bandwidth is rarely the same.
I still use Usenet BBS boards.
I've tried replacing closed-source feed reader apps, but it's hard when most of the focus is in self-hosted webapps, paid services or the UI is very uncomfortable. Also, mobile apps for this are counted and I just can't with their UIs.
Amarok 1.4. Loved that thing. Everything that came afterwards in both terms of version and other similar apps even the mainstream ones do not get close to how good Amarok used to be.
Sftp. At work we are switching to api and it sucks in comparison. Even it works its great but when it doesn't its harder to fix than sftp.
I literally can not think of anything software wise, especially FOSS as I use the command line a lot and those tools and concepts go back decades. Being a retro computer geek I can list a ton of old proprietary systems or software that I consider perfectly usable.
Oh wait, I just thought of one: RiscOS Open. The best OS for ARM besides Linux, all my Pi's run on it and it natively uses BBC BASIC, although not Free as in Freedom BBC BASIC, or even BASIC in general is a programming language that has a lot to offer.
Although not software I think the biggest thing I have in mind would be Optical Media. Most consider it obsolete, even against data tape, but I use it extensively precisely because it has features no other media possesses (ignoring LTO tape). Featurea such as many decades of longevity, cheapness (even today it's cheaper than equivalent sized flash media) and above all it's the only media that has read only properties.
SSD's, HDD's are not close to archival grade, only optical and tape (ignoring film and the ultimate archival media, vellum) are.
All my data that must be recovered at all costs is archived to BD-R, which in turn is backed up to LTO tape, which in turn is backed up into the cloud. Both the bd-r and LTO tape are written and finished days before the data has been uploaded to the cloud! Because my upload speed is 20Mb/s maximum the old SCSI LTO 4 drive writing to tape at 60MB/s wipes the floor with it, the bd-r records much slower than that but still is done in a fraction of the time.
Maybe if I'm ever able to get 1Gb upload bandwidth I'll use the cloud more, but at the moment it's running at a slower speed than my first 486 with it's 210MB HDD!