We used it for our accounting system along with Peachtree? It turned out we didn't have good backups because the system's disk drive was dirty and misaligned. I fixed it.
The backup scripts couldn't deal with going over one floppy and failed anyway.
I learned a lot of very useful things on that system - like when I created an extra copy of etc with an unprintable character in the name (etc^?) I got to learn all about using stty to set your erase character, ls -lq to find files with unprintable names and inodes along with ls -li and find -inum to fix my errant /etc^?.
Unfortunately for my accountant I didn't learn how to make a backup span multiple volumes until some time after I also learned a very hard lesson about unix device names and wiped the system drive while trying to mkfs on a new volume to expand the system.
He ended up rekeying all our accounting data from printouts and I ended up buying him more than one lunch.