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Minimum downtime way to switch server data from bad hard drive to new
Server has only one physical HDD, no raid. Around 200Gb of data and MySQLs that are per my knowledge not recommended to backup as files, but mysqldump them."Avoid the Gates of Hell. Use Linux affordable VPS."
This is why data is typically on a RAID system or at least on a separate drive, so if data drive dies you can just replace it, setup the drive and restore your data. Time depends on if you're just restoring a backup or having to reload data into MySQL. That's why its good to do test runs on a development or test system. If you have your server across the internet then you are going to drasticly slow down the process to transfer gig's of data across the internet, plus the possibility of network issues that will cause data loss or having to restart. Which now gets in to having way to test the validity of your new database data.
A lot to figure out and the value of having not only backup drives, but backup systems either hot spare computer or cold spare. This is why real disaster recovory gets expensive.A lion does not lose sleep, over the opinion of sheep.