After some firmware upgrades to our Equallogic SANs this weekend, the headers on our production database's backup file got corrupted and backups started failing. We restored the last good backup of the .bak file over the top of the bad file to restore the headers and ever since then our backups have gone from taking 3 hours to taking about 14 hours. The SQL Agent Job doing the backup hasn't changed at all. Does anyone have any ideas as to why backing up our DB is taking more than 4 times as long now and have any ideas on how to get the backup time back down?
TL;DR Our DB backup was taking about 3 hours and now takes about 14. How can I get it back down to around 3 hours.