It is my understanding that the only difference applies to hosted software. For example, Lemmy is AGPL. If it were GPL, then a company could take the source code, modify it and host their own version without open sourcing their modifications. AGPL extends to freedoms of GPL to users of hosted software as well.

A real example of this would be truth social which is modified Mastodon and as AGPL those modifications are required to be open source as well.

I use restic but I switched from Borg because of the cloud features. Outside of that, there’s not a lot of differences really. If you’re happy with Borg keep with it.

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