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The only potential issue is if you were in the middle of a write operation when the power was lost, and the central runs a journaled filesystem so even *that* isn't a problem.

Yes. And if you don't even trust the journalled filesystem, you just have to wait until the Central is quiescent: the only time it's ever "in the middle of a write operation" is when syncing, ripping, or (as indicated by the little "cogs" icon) encoding ripped tracks.
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Telnet access exists for the Central, it just requires an additional piece of hardware connected to the correct pins on the motherboard. I forget what this hardware is called, but it's been mentioned elsewhere on this BBS.

Actually that's for serial console access. Telnet access just requires installing and running telnetd...
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You can also reach a shell prompt simply by plugging in a USB keyboard and pressing ctrl-alt-del.

...which is the easiest way to gain enough control to install and run telnetd.

Peter