[Borgbackup] Can rsynced repos be used independently after the initial rsync?

[Oon-Ee Ng]

The FAQ question on this says that syncing of the repo can be done using
any tool (including rsync) as long as no backup is run to the repo while
it's being synced.

However it also notes that as a long-term solution this leaves much to be
desired, since anything corrupting the first repo would be synced over and
result in a corrupted second repo. The recommendation given is to keep
backups separate (run borg create twice, once to each).

Given I have a relatively large repo relative to my network connections
throughput, and I want to have one borg repo on a local network backup
machine and one on a remote backup machine, I was thinking about:-

1. Running rsync (would likely take slightly under a day) of the repo from
local backup machine to remote.

2. Independently using both repos after rsync is successful. That means my
backup script would call borg create repo1:/path followed by borg create
repo2:/path

Would this work, and does it have any downsides?
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