What are these folders in the dvr folder?

Channels DVR Server Raspberry Pi
#1

Are these backups?

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#2

The folders contain the Channels DVR executable programs.
Each folder is named for the version number.
Channels DVR keeps the 6 most recent versions used.
latest is a symlink that points to the current version being used, 2025.10.30.0047 in your case.

P.S. The Raspberry Pi image is no longer supported as a server https://getchannels.com/dvr-server/#rpi4