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I second what Paul suggests and have a look at a mini PC. Have you thought about getting a RS232 to USB adapter to solve your serial plug issue? In conjunction with WoL (Wake-on-LAN) if you really want to go the extra mile then have a look into UPS (Uninterruptible Power Supply) this will keep things going during power outages. (You don't want to miss that one in a lifetime moment).
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