The M1 comes with Big Sur Mac OS, which is an Apple ARM OS and not an Intel based OS. Meaning you can't ever go backward to previous versions of Mac OS on the M1!I ran into my first problem trying to install software that I needed, it would not do it. Instead I get "You do not have permission to open the application" it's not "signed correctly" is what I got on the internet and way more info than I ever needed for this problem. You will be overwhelmed by Terminal commands and techno-goop with this problem.The second problem is backup, I always backup everything 3 times and save them in various locations. Backup also includes the OS and applications, if you loose the main drive with Big Sur on it, your Mac Mini is dead and goes in a pile of electronic junk. What I am saying is you can't replace the internal SSD. To minimize this, I wanted an external SSD with the OS and all my applications on it. This is dooable but not easy, as Apple decided this is a security risk and did its best to minimize your ability to do so. They got rid of your ability to decide for yourself what level of security you wanted. I did manage to buy and install a second BIG Sur and all my apps on an external SSD drive though, but now Big Sur won't update this second drive, another "security feature". I only did this because normal backup, as I have done for decades, is completely unavailable, you can't copy your OS and apps to another location and use it in case of a HDD failure, you got it, this is a "security feature".These are just some of the problems I have had, their security features are a deal breaker. To solve this problem I am going to reset and sell the M1 and buy and older Intel bases Mini with an older OS (Mojave) add some memory to it maybe an external GPU and get on with it. This allows me to install the software I want, expand it, back it up and not spend half my life researching page after page of problem solving.Sure the M1 is fast but it does not matter if you can't install the software you want, and I guarantee Apple will keep going down this road! Life choking control is totalitarianism, Apple (insert old Apple commercial here). Maybe you have been making your computers in China too long.