Proper (as in working and recoverable..tested to be recoverable under the worst case I could think off) backups.
I wish I was kidding but the last 'complete' back up they had was from mid-2014 (and the system was still in initial development from 2013 late 2016), I started June 2017.
Outsourced development company (and bad developers and..well stuff I'd never seen before, RAID on the server but only 1 disk in use, 64bit Xeon's running 32bit Debian...and on and on it went - A backup server that had nothing on it..I mean literally nothing, the entire system runs as root (because the way to solve your inability to understanding the linux permission model is just to run everything as root apparently).
I wish I was kidding but the last 'complete' back up they had was from mid-2014 (and the system was still in initial development from 2013 late 2016), I started June 2017.
Outsourced development company (and bad developers and..well stuff I'd never seen before, RAID on the server but only 1 disk in use, 64bit Xeon's running 32bit Debian...and on and on it went - A backup server that had nothing on it..I mean literally nothing, the entire system runs as root (because the way to solve your inability to understanding the linux permission model is just to run everything as root apparently).