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I tried a few backup tools and https://github.com/andrewchambers/bupstash is my favorite by far but it's not that well known.

It was pretty fast already and recently got multithread support. It has been the only thing usable for backing up a few TB in a raspberry for performance reasons.

Keep in mind it's relatively new and the author does not yet recommend to use in production as the only backup solution.

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does this also backup mtime and ctime timestamps?

Yes and it can restore mtime and atime - but not ctime.

What can it do with ctime?

Maybe it could provide a virtual read only filesystem, mounting the backup at a specific date, using the original atime, mtime and ctime

It can provide diffs against ctime so you can see if files have been modified and then restored.

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