StartOS Mempool backup error

Just started running Knots, Electrs, & Mempool. Successfully created a backup for Knots & Electrs to a USB drive plugged into the server. But backing up Mempool fails with an I/O error. Is having the backup for Mempool critical?

No, the Mempool index finishes pretty fast, and it doesn’t really hold personal information anyway.

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That said, the IO error itself is concerning (that should not be happening). What kind of drive is it, and how is it formatted?