Everyone recommending me to install backup software and buy external hard drives is off topic. This thread is about whether several anti-ransomware programs can be use simultaneously.
Most of the responses will be the same as to "Can I run 7 Internet Security suites software in real-time?", or "Can I use 3 Ad-Blockers?", or "Can I drive a car at 60mph, whilst changing one of the tyres?".
I don't view the responses as off-topic, since they are suggestions of a better solution - for the majority of people with a PC.
Why not use a Cloud backup service such as the one built-in to Windows; OneDrive? It does everything, so you don't have to.
If you use Office 365 for word processing, it's Auto-Save function will automatically save the files to OneDrive cloud and the local sync'd OneDrive folder on the PC.
Anyway, let us know how it goes with install all the Anti-Ransomware software. Did you get any conflicts? Do they slow down your PC? Which Anti-Ransomware is your favourite? Pro's and Con's of each. Thanks.