This is just me but this is what I would do if I were you.
I've been using Cyrious Software since it's early versions. I never updated it because I use it for record keeping only - I don't estimate off of it. A few years back I began development of a spread sheet for all of my more complicated jobs and over the years I've fine tuned it. I can change my profit margins on the fly and I can input my time and see how it affected my gross profit. It helps me to remember parts of the job I wouldn't have even considered.
I do more than backup my drives because I do what's called image backups so if the drive fails I can purchase a new drive and re-image the drive to what it was - operating system, software, and all. I've had to do it a few times over the years, especially with my design system which has Flexisign, Adobe, and Corel plus all my customer graphics on it. When my drive went I replaced it two times because the drives I was purchasing would fail a week later. Things are stable now.
If I couldn't recover I would just go right to my spreadsheets, send out invoices manually, and find some free software for my customer information. Then again, I don't have a high volume business with multiple people working for me. It's me and one other person so we manage.
I like to keep it simple. Hope this helps and is food for thought.
- denis