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Two questions, and please don't take it as criticism, I am just curious about rsync but also one point you make.
"They go unmaintained" seeing as Borg is in use for quite some time, how does this look safer for rsync? For me it looks like the risk for that is similar, but I might not know background of development for these.
Second question more something I am asking myself, a lot of people seem to use rsync for backing up, but it is not incremental backup, or is it? I saw some mention of a "time machine" like implementation of rsync, but then we are again at your argument it might go unmaintained as its a separate niche implementation, or does that main rsync support incremental backup? If not, are you not missing that, how do you deal with it when just a file changes? New copy of it being transferred or somehow else?
Rsync is available out of the box in most linux distro and is used widely not only for backups, but a lot of other things, such as repository updates and transfers from file hosts. This means a lot more people are interested in it. Also the implementation, looking at the source code, is cleaner and easier to understand.
I think you should consider that not all files are equal. Rsync for me is great because I end up with a bunch of disks that contain an exact copy of the files I have on my own server. Those files don't change frequently, they are movies, pictures, songs and so on.
Other files such as code, configuration, files on my smartphone, etc... are backup up differently. I use git for most stuff that fits its model, syncthing for my temporary folders and my mobile phone.
Not every file can suit the same backup model. I trust that files that get corrupted or lost are in my weekly rsync backup. A configuration file I messed up two minutes ago is on git.
Thanks for elaborating, the part about the pictures and movies not changing makes a lot of sense actually. Thanks for sharing!
One method depends on your storage provider. Rsync may have incremental snapshots, but I haven't looked because my storage provider has it.
Sometimes a separate tool like rsnapshot (but probably not rsnapshot itself as I dont think its hard links interact well with rsync) might be used to manage snapshots locally that are then rsynced.
On to storage providers or back ends. I use B2 Backblaze configured to never delete. When a file changes it uploads the new version and renames the old version with a timestamp and hides it. Rsync has tools to recover the old file versions or delete any history. Again, it only uploads the changed files so its not full snapshots.