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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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seaweedfs
SeaweedFS is a fast distributed storage system for blobs, objects, files, and data lake, for billions of files! Blob store has O(1) disk seek, cloud tiering. Filer supports Cloud Drive, cross-DC active-active replication, Kubernetes, POSIX FUSE mount, S3 API, S3 Gateway, Hadoop, WebDAV, encryption, Erasure Coding.
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kopia
Cross-platform backup tool for Windows, macOS & Linux with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication. CLI and GUI included.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
It's in the man page[1], you put the file at the filesystem creation:
$ mkdwarfs -i /path/dir -o image.dwarfs
[1]: https://github.com/mhx/dwarfs/blob/main/doc/mkdwarfs.md
Not to be confused with dwarffs – https://github.com/edolstra/dwarffs.
Whoops: WebDAV:
https://news.ycombinator.com/item?id=39417503
SeaweedFS supports WebDAV. https://github.com/seaweedfs/seaweedfs/wiki/WebDAV
I'm not able to find if both/restic supports mounting backups as WebDAV, but in theory there's nothing stopping you.
It's 100% user space (expose a rest service) and supported by a bunch of file-browsers with a bit of a network aware component to it as well.
I think Kopia would be great for your use case
https://kopia.io/
It has a great system to snapshot files but only store data if it's changed. I use it in an environment where I can't use something like zfs to snapshot data because I don't have the ability to make decisions about what filesystem we're using. It's been amazing, love it so much!