Backlog Search On Public Torrent Sites

Hi,

I previously used SickRage to perform backlog searches via public torrent sites. Given SickRage's geriatric status, it no longer has any working public torrent sites in its default torrent provider list and custom torrent sites cannot be added for backlog search. The ultimate outcome of this is that it is not possible for me to perform backlog searches via public torrent sites.

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Does Sonarr have the ability to perform backlog searches on public torrent sites at present? If so, what public torrent sites are supported?

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Thanks for any help in advance.