Re: Advice on backing up a 2 master system
> My question is, at this point, would it be faster and safer to take one database offline and archive the entire database directory, bin logs and all.
Yes, this is valid and commonly used practice. Surely be much faster.
> And upon restore what kind of issues would I be looking at?
Most common is upgrade. If you restore to newer server you must run mysql_upgrade command (users often forget about it). Also, if you restore after long time, say 5.0.31->5.0.92, you can hit incompatibilities in data format which can not be resolved even by mysql_upgrade. In this case additional step would be required: restore backup on old version, then take mysqldump of it, then, finally, restore to newer version.
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