Hi Kevin,

Nope - we haven't removed support for the "full" backup format yet.
IMO there's no reason for a user interested in collection-level
backups to use the "full" format, so it should be safe to remove the
"incremental" parameter from the create-backup API.

In terms of removing the other code associated with the "full" format,
that might be a bit harder to remove, since it's also used by the
INSTALLSHARDDATA" API [1].  (This API didn't exist at the time SIP-12
was written.). I'd love to see a lot of the code for the "full" format
removed, but as a first step we'd probably have to figure out what the
impact would be on INSTALLSHARDDATA.

Happy to collaborate on it if you're interested in pursuing, let me know!

Best,

Jason

[1] 
https://solr.apache.org/guide/solr/latest/deployment-guide/shard-management.html#installsharddata



On Tue, Sep 9, 2025 at 10:21 AM Kevin Liang (BLOOMBERG/ 919 3RD A)
<klian...@bloomberg.net> wrote:
>
> I was reading SIP-12 regarding vision for Solr backup + restore and noticed 
> it mentions "propose that Solr drop support for creating snapshot-based 
> backups as soon as incremental backup support is available" and "if 
> incremental-backup support was added in 8.8, Solr would maintain the ability 
> to restore snapshot-based backups through 9.x".
>
> Incremental backups are already the default, per API documentation, but I am 
> wondering (with Solr 10 coming up) did/will full snapshot backup support 
> actually be removed?
>
> -Kevin

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